The subfamily Sigmodontinae is one of the most diverse groups of mammals. It includes New World rats

Rat

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus...

 and mice

Mouse

A mouse is a small mammal belonging to the order of rodents. The best known mouse species is the common house mouse . It is also a popular pet. In some places, certain kinds of field mice are also common. This rodent is eaten by large birds such as hawks and eagles...

, with at least 376 species. Many authorities include the Neotominae

Neotominae

Neotominae is a subfamily of the family Cricetidae. It consists of four tribes, 16 genera, and many species of New World rats and mice, predominantly found in North America. Among them are the well-known deer mice, white-footed mice, packrats, and grasshopper mice.Neotomines are related to the...

 and Tylomyinae

Tylomyinae

The subfamily Tylomyinae consists of several species of New World rats and mice including the vesper and climbing rats. They are not as well known as their relatives in the subfamilies Sigmodontinae and Neotominae...

 as part of a larger definition of Sigmodontinae. When those genera are included, the species count numbers at least 508. Their distribution includes much of the New World

New World

The New World is one of the names used for the Western Hemisphere, specifically America and sometimes Oceania . The term originated in the late 15th century, when America had been recently discovered by European explorers, expanding the geographical horizon of the people of the European middle...

, but the genera are predominantly South America

South America

South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

n, such as brucies. They invaded South America from Central America as part of the Great American Interchange

Great American Interchange

The Great American Interchange was an important paleozoogeographic event in which land and freshwater fauna migrated from North America via Central America to South America and vice versa, as the volcanic Isthmus of Panama rose up from the sea floor and bridged the formerly separated continents...

 near the end of the Miocene

Montehermosan

The Montehermosan age is a period of geologic time within the Miocene epoch of the Neogene used more specifically with South American Land Mammal Ages. It follows the Huayquerian and precedes the Chapadmalalan age....

, about 5 million years ago. Sigmodontines proceeded to diversify explosively in the formerly isolated continent. They inhabit many of the same ecological niche

Ecological niche

In ecology, a niche is a term describing the relational position of a species or population in its ecosystem to each other; e.g. a dolphin could potentially be in another ecological niche from one that travels in a different pod if the members of these pods utilize significantly different food...

s that the Murinae

Murinae

The Old World rats and mice, part of the subfamily Murinae in the family Muridae, comprise at least 519 species. This subfamily is larger than all mammal families except the Cricetidae and Muridae, and is larger than all mammal orders except the bats and the remainder of the...

 occupy in the Old World

Old World

The Old World consists of those parts of the world known to classical antiquity and the European Middle Ages. It is used in the context of, and contrast with, the "New World" ....

.

The "Thomasomyini" from the Atlantic Forest of Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 are generally thought to be not especially related to the "real" Thomasomyini from the northern Andes

Andes

The Andes is the world's longest continental mountain range. It is a continual range of highlands along the western coast of South America. This range is about long, about to wide , and of an average height of about .Along its length, the Andes is split into several ranges, which are separated...

 and Amazonia. The genera Wiedomys

Wiedomys

Wiedomys is a genus of South American rodents in the family Cricetidae.It contains the following species:* Cerrado Red-nosed Mouse * Red-nosed Mouse...

and Sigmodon are generally placed in their own tribe, and the "phyllotines" Irenomys, Punomys

Punomys

Punomys is a genus of rodent in the family Cricetidae.It contains the following species:* Eastern Puna Mouse * Puna Mouse...

, Euneomys

Euneomys

Euneomys is a genus of rodent in the family Cricetidae.It contains the following species:* Patagonian Chincilla Mouse * Burrowing Chincilla Mouse * Biting Chincilla Mouse...

, and Reithrodon

Reithrodon

Reithrodon is a genus of rodent in the family Cricetidae.It contains the following species:* Bunny Rat * Naked-soled Conyrat...

are considered incertae sedis.

The Sigmodontinae are divided into a number of tribes and genera:

• SUBFAMILY SIGMODONTINAE
  • Tribe Sigmodontini
    • Genus Sigmodon - Cotton Rats
      • Subgenus Sigmodon
        • Sigmodon hispidus species group
          • Allen's Cotton Rat
            Allen's Cotton Rat
            Allen's Cotton Rat is a species of rodent in the family Cricetidae.It is found only in Mexico.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
            
            , Sigmodon alleni
          • Arizona Cotton Rat
            Arizona Cotton Rat
            The Arizona cotton rat or Colorado River cotton rat is a species of rodent in the family Cricetidae. It is found in Mexico and the United States.-Description:...
            
            , Sigmodon arizonae
          • Southern Cotton Rat
            Southern cotton rat
            The southern cotton rat, Sigmodon hirsutus, is a rodent species in the family Cricetidae. It is found in southern Chiapas in Mexico through Central America, except for Belize, and as far east as northern Colombia and Venezuela. It lives in tropical rainforest, dry forest and savanna, as well as in...
            
            , Sigmodon hirsutus
          • Hispid Cotton Rat
            Hispid Cotton Rat
            The Hispid Cotton Rat is a rodent species long thought to occur in parts of South America, Central America, and southern North America. However, recent taxonomic revisions, based on mitochondrial DNA sequence data, have split this widely distributed species into three separate species. Carroll et...
            
            , Sigmodon hispidus
          • Jaliscan Cotton Rat
            Jaliscan Cotton Rat
            The Jaliscan Cotton Rat is a species of rodent in the family Cricetidae.It is found only in Mexico.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
            
            , Sigmodon mascotensis
          • Yellow-nosed Cotton Rat
            Yellow-Nosed Cotton Rat
            The yellow-nosed cotton rat is a species of rodent in the family Cricetidae. Its range extends from the eastern side of the Sierra Madre Occidental to central Durango and western Coahuila in Mexico, and from Arizona to New Mexico and scattered desert ranges of the Mesa del Norte in Trans-Pecos...
            
            , Sigmodon ochrognathus
          • Miahuatlán Cotton Rat
            Miahuatlán cotton rat
            The Miahuatlán cotton rat, Sigmodon planifrons, is a rodent species in the family Cricetidae. It is found only on the Pacific slope of the Sierra de Miahuatlán in the Mexican state of Oaxaca, where it lives in deciduous tropical forest....
            
            , Sigmodon planifrons
          • Toltec Cotton Rat
            Toltec cotton rat
            The Toltec cotton rat, Sigmodon toltecus, is a rodent species in the family Cricetidae. It is found in eastern Mexico from the Rio Grande to the Yucatán Peninsula, as well as in Belize and northern Guatemala. It prefers moist grassland habitat. While long thought to be a subspecies of S...
            
            , Sigmodon toltecus
          • Montane Cotton Rat
            Montane Cotton Rat
            The Montane Cotton Rat, Sigmodon zanjonensis, is a rodent species in the family Cricetidae. It is found in the highlands of Chiapas, Mexico and Guatemala. The eastern and southern limits of its range are as of yet undetermined....
            
            , Sigmodon zanjonensis
        • Sigmodon fulviventer species group
          • Tawny-bellied Cotton Rat
            Tawny-Bellied Cotton Rat
            The Tawny-bellied Cotton Rat is a species of rodent in the family Cricetidae.It is found in Mexico and in Arizona and New Mexico in the United States.-References:...
            
            , Sigmodon fulviventer
          • Unexpected Cotton Rat
            Unexpected Cotton Rat
            The Unexpected Cotton Rat is a species of rodent in the family Cricetidae. It is found only in Ecuador at elevations of 3500 to 4000 m, where it has been found in association with streams and marshes....
            
            , Sigmodon inopinatus
          • White-eared Cotton Rat
            White-Eared Cotton Rat
            The White-eared Cotton Rat is a species of rodent in the family Cricetidae.It is found only in Mexico.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
            
            , Sigmodon leucotis
          • Peruvian Cotton Rat
            Peruvian Cotton Rat
            The Peruvian Cotton Rat is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
            
            , Sigmodon peruanus
      • Subgenus Sigmomys
        • Alston's Cotton Rat
          Alston's Cotton Rat
          Alston's Cotton Rat, Sigmodon alstoni, is a rodent species from South America. It is found in Brazil, Colombia, Guyana, Suriname, and Venezuela, where it inhabits lowland savannas....
          
          , Sigmodon alstoni
  • Tribe Ichthyomyini
    Ichthyomyini
    Ichthyomyini is a tribe of New World rats and mice in the subfamily Sigmodontinae. The species within this tribe share the characteristic of all being fish-eating rodents.*Anotomys - Ecuadorian Fish-eating Rat*Chibchanomys - Chibchan Water Mouse...
    
    
    • Genus Anotomys - Ecuadorian Fish-eating Rat
      • Aquatic Rat
        Aquatic Rat
        The Aquatic Rat, Ecuador Fish-Eating Rat, or Fish-Eating Rat is a species of rodent in the family Cricetidae. It is the only species in the genus Anotomys.It is found only in Ecuador....
        
        , Anotomys leander
    • Genus Chibchanomys
      Chibchanomys
      Chibchanomys is a genus of rodent in the family Cricetidae.It contains the following species:* Las Cajas Water Mouse * Chibchan Water Mouse...
      
      - Water Mice
      • Las Cajas Water Mouse
        Las Cajas Water Mouse
        The Las Cajas Water Mouse is a species of rodent in the family Cricetidae. It is endemic to the Cajas National Park in Ecuador. Its natural habitat is the high grassland of the park, where it lives near streams, eating small fish and large invertebrates....
        
        , Chibchanomys orcesi
      • Chibchan Water Mouse
        Chibchan Water Mouse
        The Chibchan Water Mouse is a species of rodent in the family Cricetidae.It is found in the Andean highlands of Colombia, Peru, and Venezuela....
        
        , Chibchanomys trichotis
    • Genus Ichthyomys
      Ichthyomys
      Ichthyomys is a genus of semiaquatic rodents in the family Cricetidae.It contains the following species:* Crab-eating Rat * Pittier's Crab-eating Rat...
      
      - Crab-eating Rats
      • Crab-eating Rat
        Crab-eating Rat
        The Crab-eating Rat is a species of semiaquatic rodent in the family Cricetidae.It is found in Colombia, Ecuador, and Venezuela.Its natural habitats are rivers and swamps....
        
        , Ichthyomys hydrobates
      • Pittier's Crab-eating Rat
        Pittier's Crab-eating Rat
        Pittier's Crab-eating Rat is a species of semiaquatic rodent in the family Cricetidae.It is found only in Venezuela....
        
        , Ichthyomys pittieri
      • Stolzmann's Crab-eating Rat
        Stolzmann's Crab-eating Rat
        Stolzmann's Crab-eating Rat is a species of rodent in the family Cricetidae. It ist found in Ecuador and Peru. The species is believed to be nocturnal and semiaquatic, and has been found at an elevation range of 900 to 1700 m. A survey in 2010 indicates that it has become a pest at local fish...
        
        , Ichthyomys stolzmanni
      • Tweedy's Crab-eating Rat
        Tweedy's Crab-eating Rat
        Tweedy's Crab-Eating Rat is a species of rodent in the family Cricetidae.It is found in two disjoint regions in western Ecuador and central Panama. The species is found near fast-flowing streams in primary and secondary forest, and is known from elevations of 900 to 1700 m...
        
        , Ichthyomys tweedii
    • Genus Neusticomys
      Neusticomys
      Neusticomys is a genus of semiaquatic South American rodents in the family Cricetidae.It contains the following species:* Ferreira's Fish-eating Rat * Montane Fish-eating Rat...
      
      - Fish-eating Rats
      • Ferreira's Fish-eating Rat
        Ferreira's fish-eating rat
        Ferreira's fish-eating rat is a species of rodent in the family Cricetidae.It is known only from one lowland tropical rainforest location in the Brazilian state of Mato Grosso. It is named after 18th-century Brazilian naturalist Alexandre Rodrigues Ferreira....
        
        , Neusticomys ferreirai
      • Montane Fish-eating Rat
        Montane Fish-eating Rat
        The Montane Fish-eating Rat is a species of semiaquatic rodent in the family Cricetidae. It is distributed throughout the Andes Mountains of western Colombia and northern Ecuador.-References:...
        
        , Neusticomys monticolus
      • Musso's Fish-eating Rat
        Musso's Fish-eating Rat
        Musso's Fish-eating Rat is a species of rodent in the family Cricetidae.It is found only in Venezuela.-References:*Baillie, J. 1996. . Downloaded on 9 July 2007....
        
        , Neusticomys mussoi
      • Oyapock's Fish-eating Rat
        Oyapock's Fish-eating Rat
        Oyapock's Fish-eating Rat is a species of rodent in the family Cricetidae.It is found in French Guiana and Brazil.-References:...
        
        , Neusticomys oyapocki
      • Peruvian Fish-eating Rat
        Peruvian Fish-eating Rat
        The Peruvian Fish-eating Rat is a species of semiaquatic rodent in the family Cricetidae. It is found only in eastern Peru, where it is known from locations at elevations from 200 to 400 m.-References:...
        
        , Neusticomys peruviensis
      • Venezuelan Fish-eating Rat
        Venezuelan Fish-eating Rat
        The Venezuelan Fish-eating Rat is a species of rodent in the family Cricetidae.It is found in Guyana and Venezuela.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
        
        , Neusticomys venezuelae
    • Genus Rheomys
      Rheomys
      Rheomys is a genus of semiaquatic rodents in the family Cricetidae.It contains the following species:* Mexican Water Mouse * Goldman's Water Mouse * Thomas's Water Mouse...
      
      - Water Mice
      • Mexican Water Mouse
        Mexican Water Mouse
        The Mexican Water Mouse is a species of rodent in the family Cricetidae.It is found only in Mexico....
        
        , Rheomys mexicanus
      • Goldman's Water Mouse
        Goldman's Water Mouse
        Goldman's Water Mouse is a species of rodent in the family Cricetidae.It is found in Costa Rica and Panama....
        
        , Rheomys raptor
      • Thomas's Water Mouse
        Thomas's Water Mouse
        Thomas's Water Mouse is a species of rodent in the family Cricetidae.It is found in El Salvador, Guatemala, and Mexico....
        
        , Rheomys thomasi
      • Underwood's Water Mouse
        Underwood's Water Mouse
        Underwood's Water Mouse is a species of rodent in the family Cricetidae.It is found in Costa Rica and Panama....
        
        , Rheomys underwoodi
  • Oryzomyalia
    • Tribe Oryzomyini
      Oryzomyini
      Oryzomyini is a tribe of rodents in the subfamily Sigmodontinae of family Cricetidae. It includes about 120 species in about thirty genera, distributed from the eastern United States to the southernmost parts of South America, including many offshore islands...
      
      
      • Genus Aegialomys
        Aegialomys
        Aegialomys is a genus of oryzomyine rodents from the lowlands and mountains of western Peru and Ecuador, including the Galápagos Islands. The species in this genus have historically been placed in Oryzomys, but according to cladistic research, the genus is more closely related to a group...
        
        
        • Galápagos Rice Rat
          Galapagos Rice Rat
          Aegialomys galapagoensis, also known as the Galápagos Rice Rat or Galápagos Oryzomys, is a species of rodent in the family Cricetidae from the Galápagos Islands. It belongs to the genus Aegialomys in tribe Oryzomyini, but was previously placed in Oryzomys as Oryzomys galapagoensis. Its natural...
          
          , Aegialomys galapagoensis
        • Yellowish Rice Rat
          Yellowish Rice Rat
          Aegialomys xanthaeolus, also known as the Yellowish Oryzomys or Yellowish Rice Rat, is a species of rodent in the family Cricetidae. It belongs to the genus Aegialomys in tribe Oryzomyini, which was not recognized as distinct from Oryzomys until 2006. It is found in coastal Ecuador and Peru...
          
          , Aegialomys xanthaeolus
      • Genus Amphinectomys - Ucayali Water Rat
        • Ucayali Water Rat
          Ucayali Water Rat
          Amphinectomys savamis, also known as the Ucayali Water Rat or Amphibious Rat, is a rodent from Peruvian Amazonia. It is placed as the only member of genus Amphinectomys in the tribe Oryzomyini of family Cricetidae...
          
          , Amphinectomys savamis
      • Genus Cerradomys
        Cerradomys
        Cerradomys is a genus of oryzomyine rodents from eastern Bolivia, Paraguay, and central Brazil found in cerrado, Caatinga and Gran Chaco habitats. The species in this genus have historically been placed in Oryzomys, but according to cladistic research, they are not more closely related to the type...
        
        
        • Cerradomys langguthi
          Cerradomys langguthi
          Cerradomys langguthi is a species of rodent from South America in the genus Cerradomys. It occurs only in northeastern Brazil and was formerly included in C. subflavus.-Literature cited:...
          
          
        • Cerradomys maracajuensis
        • Cerradomys marinhus
        • Cerradomys scotti
          Cerradomys scotti
          Cerradomys scotti, also known as Lindbergh's Oryzomys, is a rodent species from South America in the genus Cerradomys. It is terrestrial and is found in the cerrado ecozone of south central Brazil, Bolivia and Paraguay...
          
          (including Oryzomys andersoni)
        • Terraced Rice Rat
          Terraced Rice Rat
          Cerradomys subflavus, also known as the Terraced Rice Rat or Flavescent Oryzomys, is a rodent species from South America in the genus Cerradomys. It is found in the states of Goiás, São Paulo, and Minas Gerais, Brazil...
          
          , Cerradomys subflavus
        • Cerradomys vivoi
          Cerradomys vivoi
          Cerradomys vivoi is a species of rodent from South America in the genus Cerradomys. It occurs only in eastern Brazil, in the states of Bahia, Goiás, and Sergipe, and was formerly included in C. subflavus.-Literature cited:...
          
          
      • Genus Drymoreomys
        Drymoreomys
        Drymoreomys is a genus of rodents in the tribe Oryzomyini, from the Atlantic Forest of Brazil. The single species, D. albimaculatus, is known only from the states of São Paulo and Santa Catarina and was not named until 2011. It lives in the humid forest on the eastern slopes of the Serra do...
        
        
        • Drymoreomys albimaculatus
      • Genus Eremoryzomys
        • Grey Rice Rat, Eremoryzomys polius
      • Genus Euryoryzomys
        Euryoryzomys
        Euryoryzomys is a genus of rodents in the tribe Oryzomyini of family Cricetidae. It includes six species, which are distributed in South America. Until 2006, its members were included in the genus Oryzomys, but they are not closely related to the type species of that genus, and therefore they were...
        
        
        • Emmons's Rice Rat
          Emmons's Rice Rat
          Euryoryzomys emmonsae, also known as Emmons's Rice Rat or Emmons' Oryzomys, is a rodent from Amazonian Brazil in the genus Euryoryzomys of the family Cricetidae. Initially misidentified as E. macconnelli or E. nitidus, it was formally described in 1998. A rainforest species, it may be...
          
          , Euryoryzomys emmonsae
        • Monster Rice Rat
          Monster Rice Rat
          Euryoryzomys lamia, also known as the Buffy-sided Oryzomys or Monster Rice Rat is a species of rodent in the genus Euryoryzomys of family Cricetidae. It is found only in central Brazil, where it lives in the cerrado.-Literature cited:...
          
          , Euryoryzomys lamia
        • Big-headed Rice Rat, Euryoryzomys legatus
        • MacConnell's Rice Rat
          MacConnell's Rice Rat
          Euryoryzomys macconnelli, also known as MacConnell's Rice Rat or MacConnell's Oryzomys, is a rodent species from South America. It is found in Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela, where it lives in lowland tropical rainforest...
          
          , Euryoryzomys macconnelli
        • Elegant Rice Rat
          Elegant Rice Rat
          Euryoryzomys nitidus, also known as the Elegant Oryzomys or Elegant Rice Rat, is a rodent species in the genus Euryoryzomys of family Cricetidae. It was previously known as Oryzomys nitidus, but is not closely related to Oryzomys as that genus is now constructed...
          
          , Euryoryzomys nitidus
        • Russet Rice Rat, Euryoryzomys russatus
      • Genus Handleyomys
        Handleyomys
        Handleyomys is a genus of Central and South American rodents in the tribe Oryzomyini of family Cricetidae. It was first described in 2002 to include two species from the Colombian Andes which were previously included in distinct and unrelated genera, Aepeomys and Oryzomys, but which turned out to...
        
        
        • Alfaro's Rice Rat
          Alfaro's Rice Rat
          Handleyomys alfaroi, also known as Alfaro's Rice Rat or Alfaro's Oryzomys, is a species of rodent in the genus Handleyomys of family Cricetidae. It is found in Belize, Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, and Panama. It was previously included in...
          
          , Handleyomys alfaroi
        • Chapman's Rice Rat
          Chapman's Rice Rat
          Handleyomys chapmani, also known as Chapman's Oryzomys or Chapman's Rice Rat, is a species of rodent in the genus Handleyomys of family Cricetidae. It is found only in Mexico...
          
          , Handleyomys chapmani
        • Dusky-footed Handley's Mouse, Handleyomys fuscatus
        • Colombian Rice Rat
          Colombian Rice Rat
          Handleyomys intectus, also known as the White-footed Handley's Mouse or Colombian Rice Rat, is a species of rodent in the genus Handleyomys of family Cricetidae. It occurs only in Colombia...
          
          , Handleyomys intectus
        • Black-eared Rice Rat
          Black-Eared Rice Rat
          Handleyomys melanotis, also known as the Black-eared Oryzomys or Black-eared Rice Rat, is a species of rodent in the genus Handleyomys of family Cricetidae. It is found in coastal lowland forest in western Mexico.-Literature cited:...
          
          , Handleyomys melanotis
        • Striped Rice Rat
          Striped Rice Rat
          Handleyomys rhabdops, also known as the Highland Oryzomys or Striped Rice Rat, is a species of rodent in the genus Handleyomys of family Cricetidae. It is nocturnal and is found in Guatemala and Mexico in montane forest at elevations from 1250 to 3250 m.-Literature cited:*Musser, G. G. and M. D....
          
          , Handleyomys rhabdops
        • Long-nosed Rice Rat
          Long-Nosed Rice Rat
          Handleyomys rostratus, also known as the Long-nosed Oryzomys, Long-nosed Rice Rat, or Rusty Rice Rat is a species of rodent in the genus Handleyomys of family Cricetidae. It is found in Belize, El Salvador, Guatemala, Honduras, Mexico, and Nicaragua. It is nocturnal and is found in forests at...
          
          , Handleyomys rostratus
        • Cloud Forest Rice Rat
          Cloud Forest Rice Rat
          Handleyomys saturatior, also known as the Cloud Forest Oryzomys or Cloud Forest Rice Rat, is a species of rodent in the genus Handleyomys of family Cricetidae....
          
          , Handleyomys saturatior
      • Genus Holochilus
        Holochilus
        Holochilus is a genus of semiaquatic rodents in the tribe Oryzomyini of family Cricetidae, sometimes called marsh rats. It contains three living species, Holochilus brasiliensis, Holochilus chacarius, and Holochilus sciureus, which are widely distributed in South America east of the Andes, and a...
        
        - Marsh Rats
        • Web-footed Marsh Rat
          Web-footed Marsh Rat
          Holochilus brasiliensis, also known as the Brazilian Marsh Rat or Web-footed Marsh Rat, is a species of semiaquatic rodent from South America. It is found in Argentina, Brazil and Uruguay.-Literature cited:...
          
          , Holochilus brasiliensis
        • Chaco Marsh Rat
          Chaco Marsh Rat
          Holochilus chacarius, also known as the Chacoan Marsh Rat or Chaco Marsh Rat, is a semiaquatic rodent species in the family Cricetidae. It is found in Argentina and Paraguay within the Gran Chaco.-Literature cited:...
          
          , Holochilus chacarius
        • Common Marsh Rat, Holochilus sciureus
      • Genus Hylaeamys
        Hylaeamys
        Hylaeamys is a genus of South American oryzomyine rodents found principally in humid forested areas east of the Andes. The species in this genus have historically been placed in Oryzomys. They are most closely related to Euryoryzomys, Transandinomys, Nephelomys, Oecomys, and Handleyomys, and most...
        
        
        • Hylaeamys acritus
          Hylaeamys acritus
          Hylaeamys acritus, formerly Oryzomys acritus, is an oryzomyine rodent of the family Cricetidae. It is known only from northeastern Bolivia. It is terrestrial and is found in moist lowland semideciduous forest and savanna.-References:...
          
          
        • Hylaeamys laticeps
          Hylaeamys laticeps
          Hylaeamys laticeps, also known as the Atlantic Forest Oryzomys or Large-headed Rice Rat, is a species of rodent in the genus Hylaeamys of family Cricetidae. It occurs in the Atlantic Forest region of southeastern Brazil...
          
          
        • Large-headed Rice Rat, Hylaeamys megacephalus
        • Sowbug Rice Rat, Hylaeamys oniscus
        • Hylaeamys perenensis
        • Tate's Rice Rat
          Tate's rice rat
          Hylaeamys tatei, also known as Tate's Oryzomys or Tate's Rice Rat, is a South American rodent species of the family Cricetidae. It is known only from the eastern foothills of the Andes in central Ecuador, where it has been found at elevations from 1130 to 1520 m. It is most closely related to...
          
          , Hylaeamys tatei
        • Yungas Rice Rat
          Yungas Rice Rat
          Hylaeamys yunganus, also known as the Amazonian Oryzomys or Yungas Rice Rat, is a species of rodent in the genus Hylaeamys of family Cricetidae. It is found in lowland tropical rainforest throughout Amazonia, in northeastern Bolivia, eastern Peru, eastern Ecuador, southeastern Colombia, southern...
          
          , Hylaeamys yunganus
      • Genus Lundomys - Lund's Amphibious Rat
        • Lund's Amphibious Rat, Lundomys molitor
      • Genus Megalomys
        Megalomys
        Megalomys is a genus of rodent in the family Cricetidae, part of the tribe Oryzomyini. The genus contains four large rodents from various Caribbean islands, all of which are now extinct. The last species to survive was M...
        
        † - Giant Rice Rats
        • Barbuda giant rice-rat, Megalomys audreyae †
        • Megalomys curazensis
          Megalomys curazensis
          Megalomys curazensis is a species of rodent from the Pleistocene of the island of Curaçao, off northwestern Venezuela. It is a member of the genus Megalomys, which also includes species from other islands of the Lesser Antilles. It is known from abundant but fragmentary material found throughout...
          
          †
        • Antillean Giant Rice Rat
          Antillean Giant Rice Rat
          Megalomys desmarestii, also known as the Martinique Muskrat, Desmarest's Pilorie, or the Antillean Giant Rice Rat, is an extinct rice rat from Martinique in the Caribbean. It was among the largest species of West Indian rice rat, as big as a cat, and was one of the first Caribbean mammals to become...
          
          , Megalomys desmarestii †
        • Santa Lucian Pilorie, Megalomys luciae †
      • Genus Melanomys
        Melanomys
        Melanomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae, which is distributed in northern South America and adjacent Central America. It contains three species, two of which—Melanomys robustulus and Melanomys zunigae—have limited distributions...
        
        - Dark Rice Rats
        • Dusky Rice Rat
          Dusky Rice Rat
          Melanomys caliginosus, also known as the Dusky Melanomys or Dusky Rice Rat, is a species of rodent in the genus Melanomys of family Cricetidae. It is found from Central America, in Honduras, Nicaragua, Costa Rica, and Panama, into South America, where it occurs in Venezuela, Colombia, and Ecuador....
          
          , Melanomys caliginosus
        • Robust Dark Rice Rat
          Robust Dark Rice Rat
          Melanomys robustulus, also known as the Robust Melanomys or Robust Dark Rice Rat, is a species of rodent in the genus Melanomys of family Cricetidae. It is found on the eastern slope of the Andes in Ecuador.-Literature cited:...
          
          , Melanomys robustulus
        • Zuniga's Dark Rice Rat
          Zuniga's Dark Rice Rat
          Melanomys zunigae, also known as Zuniga's Melanomys or Zuniga's Dark Rice Rat, is a species of rodent in the genus Melanomys of family Cricetidae. Known only from a small region of coastal Peru, it is listed as "critically endangered" by the IUCN and may even be extinct.-Literature cited:*Musser,...
          
          , Melanomys zunigae
      • Genus Microakodontomys - Brasilia's Mouse
        • Intermediate Lesser Grass Mouse, Microakodontomys transitorius
      • Genus Microryzomys
        Microryzomys
        Microryzomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae. It is closely related to Oreoryzomys, Oligoryzomys, and Neacomys. It contains two species, both restricted to the Andes: Microryzomys altissimus and Microryzomys minutus.-Literature cited:*Musser, G.G. and Carleton,...
        
        - Small Rice Rats
        • Highland Small Rice Rat
          Highland Small Rice Rat
          Microryzomys altissimus, also known as the Páramo Colilargo or Highland Small Rice Rat, is a species of rodent in the genus Microryzomys of family Cricetidae. It is found in Colombia, Ecuador, and Peru, but the Colombian segment may be a separate species.-Literature cited:*Gómez-Laverde, M., Rivas,...
          
          , Microryzomys altissimus
        • Forest Small Rice Rat
          Forest Small Rice Rat
          Microryzomys minutus, also known as the Montane Colilargo or the Forest Small Rice Rat, is a species of rodent in the genus Microryzomys of family Cricetidae. It is found in Bolivia, Colombia, Ecuador, Peru, and Venezuela, but these populations may in fact represent more than one...
          
          , Microryzomys minutus
      • Genus Mindomys
        • Hammond's Rice Rat
          Hammond's Rice Rat
          Mindomys hammondi, also known as Hammond's Rice Rat or Hammond's Oryzomys, is a species of rodent in the tribe Oryzomyini of family Cricetidae...
          
          , Mindomys hammondi
      • Genus Neacomys
        Neacomys
        The genus Neacomys, also known as bristly mice because of their spiny fur, includes several species of rodents in the tribe Oryzomyini of family Cricetidae. It is most closely related to Oligoryzomys, Oreoryzomys, and Microryzomys. Neacomys species are mainly found in Amazonia, but N. pictus occurs...
        
        - Bristly Mice
        • Dubost's Bristly Mouse, Neacomys dubosti
        • Guiana Bristly Mouse
          Guiana Bristly Mouse
          Neacomys guianae, also known as the Guianan Neacomys or Guiana Bristly Mouse, is a nocturnal rodent species from South America. It is found in lowland tropical rainforests in northeastern Brazil, French Guiana, Guyana, Suriname and Venezuela. Its diet consists of insects, seeds and...
          
          , Neacomys guianae
        • Small Bristly Mouse, Neacomys minutus
        • Musser's Bristly Mouse, Neacomys musseri
        • Paracou Bristly Mouse, Neacomys paracou
        • Painted Bristly Mouse
          Painted Bristly Mouse
          Neacomys pictus, also known as the Painted Neacomys or Painted Bristly Mouse, is a species of rodent in the genus Neacomys of family Cricetidae. It is found only in Panama.-Literature cited:...
          
          , Neacomys pictus
        • Common Bristly Mouse, Neacomys spinosus
        • Narrow-footed Bristly Mouse
          Narrow-footed Bristly Mouse
          Neacomys tenuipes, also known as the Narrow-footed Neacomys or Narrow-footed Bristly Mouse, is found along the northern Andes from northwestern Venezuela through Colombia into Ecuador, in rainforest at elevations from 400 to 1750 m...
          
          , Neacomys tenuipes
      • Genus Nectomys
        Nectomys
        Nectomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae. It is closely related to Amphinectomys and was formerly considered congeneric with Sigmodontomys...
        
        - Water Rats
        • Western Amazonian Nectomys
          Western Amazonian Nectomys
          Nectomys apicalis, also known as the Western Amazonian Nectomys, is a semiaquatic species of rodent in the genus Nectomys of family Cricetidae. It is found east of the Andes in Ecuador, Peru, and Bolivia, east into western Brazil; further to the east, it is replaced by N. rattus...
          
          , Nectomys apicalis
        • Magdalena Nectomys
          Magdalena Nectomys
          Nectomys magdalenae, also known as the Magdalena Nectomys, is a nocturnal, semiaquatic species of rodent in the genus Nectomys of family Cricetidae. It is found in northwestern Colombia at altitudes from sea level to 2000 m, including near the Magdalena River .-Literature cited:*Delgado, C.,...
          
          , Nectomys magdalenae
        • Trinidad Water Rat
          Trinidad Water Rat
          Nectomys palmipes, also known as the Trinidad Nectomys or Trinidad Water Rat, is a species of rodent in genus Nectomys of family Cricetidae. It is found on the island of Trinidad and on the nearby mainland of Venezuela.-Literature cited:...
          
          , Nectomys palmipes
        • Amazonian Nectomys, Nectomys rattus
        • South American Water Rat, Nectomys squamipes
      • Genus Nephelomys
        Nephelomys
        Nephelomys is a genus of South American oryzomyine rodents found in the Andes from Bolivia to Venezuela, with a westward extension into the mountains of Costa Rica...
        
        
        • Tomes's Rice Rat
          Tomes's Rice Rat
          Nephelomys albigularis, also known as the White-throated Oryzomys or Tomes's Rice Rat, is a species of rodent in the genus Nephelomys of family Cricetidae. Described in 1860, it was the first Nephelomys species to be discovered...
          
          , Nephelomys albigularis
        • Ecuadorian Rice Rat, Nephelomys auriventer
        • Caracol Rice Rat, Nephelomys caracolus
        • Nephelomys childi
          Nephelomys childi
          Nephelomys childi is a species of rodent in the genus Nephelomys of family Cricetidae. The type locality is at Bogotá, Colombia, and the type locality of its junior synonym, oconnelli, is at a place known as Buenavista, about southeast of Bogotá. It was named after Mr. George D...
          
          
        • Boquete Rice Rat
          Boquete Rice Rat
          Nephelomys devius, also known as the Talamancan Oryzomys, Boquete Rice Rat, Chiriqui Rice Rat, or Montane Rice Rat, is a species of rodent in the genus Nephelomys of family Cricetidae. It is found in cloud forest in the highlands of Costa Rica and western Panama.The upperparts are light brown and...
          
          , Nephelomys devius
        • Keays's Rice Rat
          Keays's Rice Rat
          Nephelomys keaysi, also known as Keays's Oryzomys or Keays's Rice Rat, is a species of rodent in the genus Nephelomys of family Cricetidae. It is found from southeastern Peru to northern Bolivia on the eastern slope of the Andes in Yungas humid forest at altitudes of 1000 to 2600 m...
          
          , Nephelomys keaysi
        • Light-footed Rice Rat
          Light-Footed Rice Rat
          Nephelomys levipes, also known as the Nimble-footed Oryzomys or Light-footed Rice Rat, is a species of rodent in the genus Nephelomys of family Cricetidae. It is found on the eastern slope of the Andes from southeastern Peru into west-central Bolivia in cloud forest at elevations from . It occurs...
          
          , Nephelomys levipes
        • Nephelomys meridensis
        • Nephelomys moerex
          Nephelomys moerex
          Nephelomys moerex is a species of rodent in the genus Nephelomys of family Cricetidae. The type locality is at Mindo in western Ecuador, where it has been recorded together with three other rodents of the oryzomyine group, Sigmodontomys aphrastus, Mindomys hammondi, and Handleyomys alfaroi, as well...
          
          
        • Nephelomys nimbosus
          Nephelomys nimbosus
          Nephelomys nimbosus is a species of rodent in the genus Nephelomys of family Cricetidae. Its type locality is at San Antonio on the northeastern slope of the Tungurahua in the Andes of Ecuador, at an altitude of about . The type series included five individuals.The fur of the upperparts is brown to...
          
          
        • Nephelomys pectoralis
          Nephelomys pectoralis
          Nephelomys pectoralis is a species of rodent in the genus Nephelomys of family Cricetidae. Its type locality is west of the city of Popayán, Cauca Department, Colombia, at an altitude of . American zoologist Joel Asaph Allen first described it in 1912 on the basis of 112 specimens from several...
          
          
        • Mount Pirre Rice Rat, Nephelomys pirrensis
      • Genus Nesoryzomys
        Nesoryzomys
        Nesoryzomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae, endemic to the Galápagos Islands. Other rodents restricted to the Galápagos include Megaoryzomys curioi and Aegialomys galapagoensis.-References:...
        
        - Galapagos Mice
        • Darwin's Galápagos Mouse, Nesoryzomys darwini †
        • Fernandina Rice Rat, Nesoryzomys fernandinae
        • Indefatigable Galápagos Mouse
          Indefatigable Galapagos Mouse
          Nesoryzomys indefessus, also known as the Santa Cruz Nesoryzomys or Indefatigable Galápagos Mouse, is a rodent of the genus Nesoryzomys of family Cricetidae from Galápagos Islands of Ecuador. It contains two subspecies: one formerly lived on Santa Cruz Island, but is now extinct, probably due to...
          
          , Nesoryzomys indefessus
        • Santiago Galápagos Mouse
          Santiago Galapagos Mouse
          Nesoryzomys swarthi, also known as the Santiago Nesoryzomys or Santiago Galápagos Mouse, is a species of rodent in the genus Nesoryzomys of family Cricetidae....
          
          , Nesoryzomys swarthi
      • Genus Noronhomys - Vespucci's Rodent †
        • Vespucci's Rodent
          Vespucci's Rodent
          Noronhomys vespuccii, also known as Vespucci's Rodent, is an extinct rat species from the islands of Fernando de Noronha off northeastern Brazil. Italian explorer Amerigo Vespucci may have seen it on a visit to Fernando de Noronha in 1503, but it subsequently became extinct, perhaps because of the...
          
          , Noronhomys vespuccii †
      • Genus Oecomys
        Oecomys
        Oecomys is a genus of rodent within the tribe Oryzomyini of family Cricetidae. It contains about 17 species, which live in trees and are distributed across forested parts of South America, extending into Panama and Trinidad.-Literature cited:...
        
        - Arboreal Rice Rats
        • North Amazonian Arboreal Rice Rat, Oecomys auyantepui
        • Bicolored Arboreal Rice Rat
          Bicolored Arboreal Rice Rat
          Oecomys bicolor, also known as the White-bellied Oecomys or Bicolored Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae...
          
          , Oecomys bicolor
        • Atlantic Forest Oecomys
          Atlantic Forest Oecomys
          Oecomys catherinae, also known as the Atlantic Forest Oecomys, is a species of rodent in the genus Oecomys from eastern Brazil, where it lives in a variety of habitats including the Atlantic forest, cerrado and caatinga. It is related to Oecomys trinitatis, but has thicker fur.-Literature...
          
          , Oecomys catherinae
        • Cleber's Arboreal Rice Rat
          Cleber's Arboreal Rice Rat
          Oecomys cleberi, also known as Cleber's Oecomys or Cleber's Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. Known only from the Federal District of Brazil, its taxonomic status relative to O. concolor and O. paricola is unresolved.-Literature cited:*Costa, L.,...
          
          , Oecomys cleberi
        • Unicolored Rice Rat, Oecomys concolor
        • Yellow Arboreal Rice Rat
          Yellow Arboreal Rice Rat
          Oecomys flavicans, also known as the Tawny Oecomys or Yellow Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found in the mountains of northwestern Venezuela and nearby Colombia.-Literature cited:...
          
          , Oecomys flavicans
        • Mamore Arboreal Rice Rat
          Mamore Arboreal Rice Rat
          Oecomys mamorae, also known as the Mamore Oecomys or Mamore Arboreal Rice Rat, is an arboreal species of rodent in the genus Oecomys of family Cricetidae. Its distribution extends over much of Bolivia and into nearby Brazil and Paraguay. Although Oecomys has been recorded from Argentina, it is...
          
          , Oecomys mamorae
        • Brazilian Arboreal Rice Rat
          Brazilian Arboreal Rice Rat
          Oecomys paricola, also known as the Brazilian Oecomys, Brazilian Arboreal Rice Rat, or South Amazonian Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found in central Brazil south of the Amazon, where it lives in lowland tropical rainforest.-Literature...
          
          , Oecomys paricola
        • Dusky Arboreal Rice Rat
          Dusky Arboreal Rice Rat
          Oecomys phaeotis, also known as the Dusky Arboreal Rice Rat or Dusky Oecomys, is a species of rodent in the genus Oecomys of family Cricetidae. It is found on the eastern slopes of the Andes of Peru, at 1500 to 2000 m altitude....
          
          , Oecomys phaeotis
        • King Arboreal Rice Rat
          King Arboreal Rice Rat
          Oecomys rex, also known as the Regal Oecomys or King Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found in Guyana, Suriname, French Guiana, and nearby parts of Venezuela and Brazil....
          
          , Oecomys rex
        • Robert's Arboreal Rice Rat
          Robert's Arboreal Rice Rat
          Oecomys roberti, also known as Robert's Oecomys or Robert's Arboreal Rice Rat, is a rodent species from South America in the genus Oecomys. It has a broad distribution in Amazonia, being found in Bolivia, Brazil, French Guiana, Guyana, Peru, Suriname and Venezuela.-Literature cited:*Costa, L.,...
          
          , Oecomys roberti
        • Red Arboreal Rice Rat
          Red Arboreal Rice Rat
          Oecomys rutilus, also known as the Reddish Oecomys or Red Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found in Guyana, Suriname, French Guiana, and nearby regions of Brazil and Venezuela....
          
          , Oecomys rutilus
        • Arboreal Rice Rat
          Arboreal Rice Rat
          Oecomys auyantepui, also known as the Guianan Oecomys and North Amazonian Arboreal Rice Rat, is a species of rodent in the genus Oecomys from South America. It is found in Guyana, Suriname, French Guiana, and nearby regions of Venezuela and Brazil.-Literature cited:*Duff, A. and Lawson, A. 2004....
          
          , Oecomys speciosus
        • Foothill Arboreal Rice Rat
          Foothill Arboreal Rice Rat
          Oecomys superans, also known as the Large Oecomys or Foothill Arboreal Rice Rat, is a species of rodent in the genus Oecomys of family Cricetidae. It is found along the eastern slope of the Andes in southern Colombia, Ecuador, and Peru and east into Amazonia, including parts of Brazil...
          
          , Oecomys superans
        • Oecomys sydandersoni
          Oecomys sydandersoni
          Oecomys sydandersoni is an arboreal species of rodent in the genus Oecomys. It lives in forest patches in a small area in eastern Bolivia. It is a medium-sized species, weighing about 45 g , with mostly grayish and brownish fur and short and broad hindfeet with well-developed pads.First...
          
          
        • Long-furred Rice Rat, Oecomys trinitatis
      • Genus Oligoryzomys
        Oligoryzomys
        Oligoryzomys is a genus of rodents in the tribe Oryzomyini of family Cricetidae. Many species are known as pygmy rice rats or colilargos...
        
        - Pygmy Rice Rats
        • Andean Pygmy Rice Rat
          Andean Pygmy Rice Rat
          Oligoryzomys andinus, also known as the Andean Colilargo or Andean Pygmy Rice Rat, is a species of rodent in genus Oligoryzomys of family Cricetidae. It is found in the Andes of southern Peru and western Bolivia, but may in fact include more than one species.-Literature cited:*Musser, G.G. and...
          
          , Oligoryzomys andinus
        • Sandy Pygmy Rice Rat
          Sandy Pygmy Rice Rat
          Oligoryzomys arenalis, also known as the Sandy Colilargo or Sandy Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in the Andes of Peru at 400 to 2850 m altitude, but may include more than one species.-Literature cited:*Musser, G.G. and Carleton,...
          
          , Oligoryzomys arenalis
        • Brenda's Colilargo
          Brenda's Colilargo
          Oligoryzomys brendae, also known as Brenda's Colilargo, is a South American species of rodent in the genus Oligoryzomys. It is found only in Tucumán Province in northwestern Argentina, but its taxonomic status requires revision....
          
          , Oligoryzomys brendae
        • Chacoan Pygmy Rice Rat
          Chacoan Pygmy Rice Rat
          Oligoryzomys chacoensis, also known as the Chacoan Colilargo or Chacoan Pygmy Rice Rat, is a rodent species from South America. It is found in the Gran Chaco region of southeastern Bolivia, southwestern Brazil, Paraguay, and northeastern Argentina.It is one of the hosts of the Hantavirus serotype...
          
          , Oligoryzomys chacoensis
        • Destructive Pygmy Rice Rat
          Destructive Pygmy Rice Rat
          Oligoryzomys destructor, also known as Tschudi's Colilargo or the Destructive Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae...
          
          , Oligoryzomys destructor
        • Yellow Pygmy Rice Rat
          Yellow Pygmy Rice Rat
          Oligoryzomys flavescens, also known as the Flavescent Colilargo or Yellow Pygmy Rice Rat is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in southern South America, occurring in southern Brazil, Paraguay, Uruguay, and northeastern Argentina.-Literature...
          
          , Oligoryzomys flavescens
        • Fornes' Colilargo
          Fornes' Colilargo
          Oligoryzomys fornesi, also known as Fornes' Colilargo, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found from northeastern Brazil via Paraguay into northeastern Argentina.-Literature cited:...
          
          , Oligoryzomys fornesi
        • Fulvous Pygmy Rice Rat
          Fulvous Pygmy Rice Rat
          Oligoryzomys fulvescens, also known as the Fulvous Colilargo, Fulvous Pygmy Rice Rat, or Northern Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae...
          
          , Oligoryzomys fulvescens
        • Grayish Pygmy Rice Rat
          Grayish Pygmy Rice Rat
          Oligoryzomys griseolus, also known as the Grizzled Colilargo or the Grayish Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in the Andes of Venezuela and nearby Colombia.-Literature cited:...
          
          , Oligoryzomys griseolus
        • Long-tailed Pygmy Rice Rat
          Long-Tailed Pygmy Rice Rat
          Oligoryzomys longicaudatus, also known as the Long-tailed Colilargo or Long-tailed Pygmy Rice Rat, is a species of rodent in the genus Oryzomys of family Cricetidae. It is found in the southern Andes of Chile and Argentina, with an outlying population in eastern Argentina.-Literature cited:*Musser,...
          
          , Oligoryzomys longicaudatus
        • Magellanic Pygmy Rice Rat
          Magellanic Pygmy Rice Rat
          Oligoryzomys magellanicus, also known as the Patagonian Colilargo and the Magellanic Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in southernmost Argentina and Chile, including Tierra del Fuego.-Literature cited:*Musser, G.G. and Carleton, M.D....
          
          , Oligoryzomys magellanicus
        • Small-eared Pygmy Rice Rat
          Small-eared Pygmy Rice Rat
          Oligoryzomys microtis, also known as the Small-eared Colilargo or Small-eared Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found in western Brazil, eastern Peru, Bolivia, and northern Paraguay....
          
          , Oligoryzomys microtis
        • Oligoryzomys moojeni
        • Black-footed Pygmy Rice Rat
          Black-footed Pygmy Rice Rat
          Oligoryzomys nigripes, also known as the Black-footed Colilargo or the Black-footed Pygmy Rice Rat, is a rodent in the genus Oligoryzomys of family Cricetidae. It is found from Pernambuco in northeastern Brazil through the Atlantic Forest and Cerrado into Paraguay, Uruguay, and Argentina, where it...
          
          , Oligoryzomys nigripes
        • Oligoryzomys rupestris
        • Straw-colored Pygmy Rice Rat
          Straw-colored Pygmy Rice Rat
          Oligoryzomys stramineus, also known as the Straw-colored Colilargo or Straw-colored Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It occurs only in the cerrado and caatinga of northeastern Brazil....
          
          , Oligoryzomys stramineus
        • Sprightly Pygmy Rice Rat
          Sprightly Pygmy Rice Rat
          Oligoryzomys vegetus, also known as the Sprightly Colilargo or Sprightly Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of family Cricetidae. It is found only in the mountains of Costa Rica and western Panama....
          
          , Oligoryzomys vegetus
        • St. Vincent Pygmy Rice Rat
          St. Vincent Pygmy Rice Rat
          Oligoryzomys victus, also known as the St. Vincent Colilargo or St. Vincent Pygmy Rice Rat, is a species of rodent in the genus Oligoryzomys of the oryzomyine tribe. Only one specimen is known, which was collected on Saint Vincent in the Lesser Antilles in about 1892, and it is now presumed...
          
          , Oligoryzomys victus †
      • Genus Oryzomys
        Oryzomys
        Oryzomys is a genus of semiaquatic rodents in the tribe Oryzomyini living in southern North America and far northern South America. It includes eight species, two of which—the marsh rice rat of the United States and O. couesi of Mexico and Central America—are widespread; the six others have...
        
        - Rice Rats
        • Oryzomys albiventer
          Oryzomys albiventer
          Oryzomys albiventer is a rodent in the genus Oryzomys of family Cricetidae from interior western Mexico, in the states of Jalisco, Guanajuato, and Michoacán. First described in 1901 as a separate species, it was later lumped under O. couesi and the marsh rice rat until it was reinstated as a...
          
          
        • Jamaican Rice Rat
          Jamaican Rice Rat
          Oryzomys antillarum, also known as the Jamaican rice rat, is an extinct rodent of Jamaica. A member of the genus Oryzomys within the family Cricetidae, it is similar to O. couesi of mainland Central America, from where it may have dispersed to its island during the last glacial period...
          
          , Oryzomys antillarum †
        • Coues' Rice Rat
          Coues' Rice Rat
          Oryzomys couesi, also known as Coues' Rice Rat, is a semiaquatic rodent in the family Cricetidae occurring from southernmost Texas through Mexico and Central America into northwestern Colombia. It is usually found in wet habitats, such as marshes, but also lives in drier forests and shrublands...
          
          , Oryzomys couesi
        • Thomas's Rice Rat, Oryzomys dimidiatus
        • Gorgas's Rice Rat
          Gorgas's Rice Rat
          Oryzomys gorgasi, also known as Gorgas's Oryzomys or Gorgas's Rice Rat, is a rodent in the genus Oryzomys of family Cricetidae. First collected as a living animal in 1967, it is known from only a few localities, including a freshwater swamp in the lowlands of northwestern Colombia and a mangrove...
          
          , Oryzomys gorgasi
        • Oryzomys nelsoni †
        • Marsh Rice Rat
          Marsh Rice Rat
          The marsh rice rat is a semiaquatic North American rodent in the family Cricetidae. It is found mostly in the eastern and southern United States, from New Jersey and Kansas south to Florida and northeasternmost Tamaulipas, Mexico; its range previously extended further west and north, where it may...
          
          , Oryzomys palustris
        • Lower California Rice Rat, Oryzomys peninsulae ?†
      • Genus Pseudoryzomys - False Rice Rats
        • Brazilian False Rice Rat
          Brazilian False Rice Rat
          Pseudoryzomys simplex, also known as the Brazilian False Rice Rat or False Oryzomys, is a species of rodent in the family Cricetidae from south-central South America. It is found in lowland palm savanna and thorn scrub habitats...
          
          , Pseudoryzomys simplex
      • Genus Scolomys
        Scolomys
        Scolomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae. Some evidence suggests that it is related to Zygodontomys. It is characterized, among other traits, by spiny fur. It contains two species, Scolomys melanops and Scolomys ucayalensis.-Literature cited:*Musser, G.G. and...
        
        - New World Spiny Mice
        • South American Spiny Mouse
          South American Spiny Mouse
          Scolomys melanops, also known as the Short-nosed Scolomys, South American Spiny Mouse, or Ecuadorian Spiny Mouse, is a species of rodent in the genus Scolomys of family Cricetidae. It is found only in Ecuador.-Literature cited:...
          
          , Scolomys melanops
        • Ucayali Spiny Mouse
          Ucayali Spiny Mouse
          Scolomys ucayalensis, also known as the Long-nosed Scolomys or Ucayali Spiny Mouse is a nocturnal rodent species from South America. It is part of the genus Scolomys within the tribe Oryzomyini. It is found in Brazil, Colombia, Ecuador and Peru, at elevations from in the Amazon...
          
          , Scolomys ucayalensis
      • Genus Sigmodontomys
        Sigmodontomys
        Sigmodontomys is a genus of rodent in the tribe Oryzomyini of family Cricetidae. It is related to Nectomys and Melanomys and was previously included in Nectomys. It includes two species, Sigmodontomys alfari and the much rarer Sigmodontomys aphrastus, but whether these are indeed each other's...
        
        - Rice Water Rats
        • Alfaro's Rice Water Rat
          Alfaro's Rice Water Rat
          Sigmodontomys alfari, also known as the Short-tailed Sigmodontomys, Alfaro's Rice Water Rat, Cana Rice Rat, or Allen's Rice Rat, is a species of rodent in the genus Sigmodontomys of family Cricetidae...
          
          , Sigmodontomys alfari
        • Harris's Rice Water Rat
          Harris's Rice Water Rat
          Sigmodontomys aphrastus, also known as the Long-tailed Sigmodontomys, Harris's Rice Water Rat, or Long-tailed Rice Rat, is a species of rodent in genus Sigmodontomys of family Cricetidae. It is known from Costa Rica, Panama, and Ecuador.-Literature cited:*Duff, A. and Lawson, A. 2004. Mammals of...
          
          , Sigmodontomys aphrastus
      • Genus Sooretamys
        • Rat-headed Rice Rat, Sooretamys angouya
      • Genus Transandinomys
        Transandinomys
        Transandinomys is a genus of rodents in the tribe Oryzomyini of family Cricetidae. It includes two species—T. bolivaris and T. talamancae—found in forests from Honduras in Central America south and east to southwestern Ecuador and northwestern Venezuela in northern South America...
        
        
        • Long-whiskered Rice Rat, Transandinomys bolivaris
        • Transandinomys talamancae
      • Genus Zygodontomys
        Zygodontomys
        Zygodontomys is a genus of rodent in the tribe Oryzomyini of the family Cricetidae. Its closest relative may be Scolomys. It ranges from Central America east to the Guianas. It contains two species: Zygodontomys brunneus and Zygodontomys brevicauda....
        
        - Cane Mice
        • Short-tailed Cane Mouse, Zygodontomys brevicauda
        • Colombian Cane Mouse, Zygodontomys brunneus
    • Tribe Thomasomyini
      • Genus Abrawayaomys - Ruschi's Rat
        • Ruschi's Rat
          Ruschi's Rat
          Ruschi's Rat , Abrawayaomys ruschii, is a rodent species found in Argentina and Brazil. Some cranial features suggest it may be an archaic relative of the Thomas's Parmo mouse . The upper parts are greyish yellow with a darker head and yellowish-white underparts...
          
          , Abrawayaomys ruschii
      • Genus Aepeomys
        Aepeomys
        Aepeomys is a genus of rodent in the family Cricetidae.It contains the following species:* Olive Montane Mouse * Reig's Montane Mouse...
        
        - Montane Mice
        • Olive Montane Mouse
          Olive Montane Mouse
          The Olive Montane Mouse is a species of rodent in the family Cricetidae.It is found in Ecuador and Venezuela....
          
          , Aepeomys lugens
        • Reig's Montane Mouse
          Reig's Montane Mouse
          Reig's Montane Mouse is a species of rodent in the family Cricetidae.It is found only in Venezuela. It is named after Argentine biologist Osvaldo Reig ....
          
          , Aepeomys reigi
      • Genus Chilomys - Columbian Forest Mouse
        • Colombian Forest Mouse
          Colombian Forest Mouse
          The Colombian Forest Mouse is a species of rodent in the family Cricetidae. It is the only species in the genus Chilomys.It is found in Colombia, Ecuador, and Venezuela.-References:...
          
          , Chilomys instans
      • Genus Delomys
        Delomys
        Delomys is a genus of South American rodents in the tribe Thomasomyini of family Cricetidae. Three species are known, all found in Argentina and Brazil. They are as follows:* Montane Atlantic Forest Rat...
        
        - Atlantic Forest Rats
        • Montane Atlantic Forest Rat
          Montane Atlantic Forest rat
          The montane Atlantic Forest rat is a rodent species from South America. It is endemic to part of the Atlantic Forest region of southeastern Brazil, where it is found at elevations from 1000 to 2700 m....
          
          , Delomys collinus
        • Striped Atlantic Forest Rat
          Striped Atlantic Forest Rat
          The Striped Atlantic Forest Rat, Delomys dorsalis, is a rodent species from South America. It is found in Argentina and Brazil....
          
          , Delomys dorsalis
        • Pallid Atlantic Forest Rat
          Pallid Atlantic Forest Rat
          The Pallid Atlantic Forest Rat, Delomys sublineatus, is a rodent species from South America. It is found in Brazil....
          
          , Delomys sublineatus
      • Genus Phaenomys - Rio de Janeiro Arboreal Rat
        • Rio de Janeiro Arboreal Rat
          Rio de Janeiro Arboreal Rat
          The Rio de Janeiro Arboreal Rat, Phaenomys ferrugineus, is a rodent species from South America. It is found in Brazil. It is the only species in the genus Phaenomys....
          
          , Phaenomys ferrugineus
      • Genus Rhagomys
        Rhagomys
        Rhagomys is a genus of South American rodents in the tribe Thomasomyini of family Cricetidae. Two species are known, found in Bolivia, southeast Peru and the Atlantic Forest of southeast Brazil. They are as follows:...
        
        - Arboreal Mice
        • Long-tongued Arboreal Mouse
          Long-tongued arboreal mouse
          The long-tongued arboreal mouse, Rhagomys longilingua, is a rodent species from South America. It is found in a variety of habitats in Bolivia and Peru at elevations from 450 to 2100 m. The species is at least partly arboreal....
          
          , Rhagomys longilingua
        • Brazilian Arboreal Mouse
          Brazilian Arboreal Mouse
          The Brazilian Arboreal Mouse, Rhagomys rufescens, is a rodent species from South America. It is found in the Atlantic Forest of southeast Brazil....
          
          , Rhagomys rufescens
      • Genus Rhipidomys
        Rhipidomys
        Rhipidomys is a genus of rodents in the family Cricetidae, comprising at least 18 species of climbing mouse:* Southern Climbing Mouse * Cariri Climbing Mouse...
        
        - Climbing Mice
        • Southern Climbing Mouse
          Southern Climbing Mouse
          The Southern Climbing Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Bolivia.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Rhipidomys austrinus
        • Cariri Climbing Mouse
          Cariri climbing mouse
          The Cariri climbing mouse, Rhipidomys cariri, is a partly arboreal rodent species from South America. It is known from two mesic localities in Ceara, northeastern Brazil, within the semiarid caatinga ecoregion. It has been found in areas under cultivation. Cariri is the name of an administrative...
          
          , Rhipidomys cariri
        • Cauca Climbing Mouse
          Cauca Climbing Mouse
          The Cauca Climbing Mouse is a species of arboreal rodent in the family Cricetidae. It is endemic to Colombia, where it is found in montane forest at elevations from 2200 to 3500 m.-References:...
          
          , Rhipidomys caucensis
        • Coues's Climbing Mouse
          Coues's Climbing Mouse
          Coues's Climbing Mouse is a species of rodent in the family Cricetidae.It is found in Colombia, Ecuador, Peru, Trinidad and Tobago, and Venezuela. It is named after American zoologist Elliott Coues.-References:...
          
          , Rhipidomys couesi
        • Eastern Amazon Climbing Mouse
          Eastern Amazon climbing mouse
          The eastern Amazon climbing mouse, Rhipidomys emiliae, is a rodent species from South America. It is endemic to central Brazil, where it is found in the eastern fringe of the Amazon Rainforest, as well as in gallery forest and tropical dry forest within the cerrado ecoregion. It is often found in...
          
          , Rhipidomys emiliae
        • Buff-bellied Climbing Mouse
          Buff-Bellied Climbing Mouse
          The Buff-bellied Climbing Mouse is a species of rodent in the family Cricetidae.It is found in Colombia and Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Rhipidomys fulviventer
        • Gardner's Climbing Mouse
          Gardner's Climbing Mouse
          Gardner's Climbing Mouse, Rhipidomys gardneri, is a rodent species from South America. It is found in Brazil and Peru....
          
          , Rhipidomys gardneri
        • Broad-footed Climbing Mouse
          Broad-Footed Climbing Mouse
          The Broad-footed Climbing Mouse is a species of rodent in the family Cricetidae. It is found in Colombia, Ecuador, Panama and Peru....
          
          , Rhipidomys latimanus
        • White-footed Climbing Mouse
          White-footed Climbing Mouse
          The White-footed Climbing Mouse, Rhipidomys leucodactylus, is a South American rodent species found in Bolivia, Brazil, Ecuador, French Guiana, Guyana, Peru, Suriname and Venezuela....
          
          , Rhipidomys leucodactylus
        • MacConnell's Climbing Mouse
          MacConnell's Climbing Mouse
          MacConnell's Climbing Mouse, Rhipidomys macconnelli, is a nocturnal and arboreal rodent species from South America. It is found in Brazil, Guyana and Venezuela, where it inhabits rainforest at elevations from 300 to 2800 m....
          
          , Rhipidomys macconnelli
        • Cerrado Climbing Mouse
          Cerrado climbing mouse
          The cerrado climbing mouse is an arboreal rodent species in the family Cricetidae from South America. It is found in central and eastern Brazil in forests of the cerrado and caatinga, and has also been seen in the Atlantic Forest. Its karyotype is 2n = 44, FN = 48-52.It is sometimes commonly known...
          
          , Rhipidomys macrurus
        • Atlantic Forest Climbing Mouse
          Atlantic Forest climbing mouse
          The Atlantic Forest climbing mouse is an arboreal rodent species in the family Cricetidae from South America. It is found in the Atlantic Forest of southeastern Brazil at elevations from sea level to 1500 m. Its karyotype is 2n = 44, FN = 74-80.It is sometimes also referred to as the long-tailed...
          
          , Rhipidomys mastacalis
        • Peruvian Climbing Mouse
          Peruvian climbing mouse
          The Peruvian climbing mouse, Rhipidomys modicus, is a rodent species from South America. It is endemic to the eastern slopes of the Andes in central Peru, where it is found at altitudes from 700 to 1800 m. The species is nocturnal and arboreal, and lives in lower montane forest and cloud forest. It...
          
          , Rhipidomys modicus
        • Splendid Climbing Mouse
          Splendid Climbing Mouse
          The Splendid Climbing Mouse, Rhipidomys nitela, is a rodent species from South America. It is found in Brazil, French Guyana, Guyana, Suriname and Venezuela....
          
          , Rhipidomys nitela
        • Yellow-bellied Climbing Mouse
          Yellow-Bellied Climbing Mouse
          The Yellow-bellied Climbing Mouse is a species of arboreal rodent in the family Cricetidae. It is known only from southeastern Peru, where it has been found in cloud forest at an elevation of 1830 m. This species was long known only by the type collection until it was rediscovered in May...
          
          , Rhipidomys ochrogaster
        • Venezuelan Climbing Mouse
          Venezuelan Climbing Mouse
          The Venezuelan Climbing Mouse is a species of rodent in the family Cricetidae.It is found in Colombia and Venezuela....
          
          , Rhipidomys venezuelae
        • Charming Climbing Mouse
          Charming Climbing Mouse
          The Charming Climbing Mouse is a species of nocturnal rodent in the family Cricetidae.It is found only in Venezuela....
          
          , Rhipidomys venustus
        • Wetzel's Climbing Mouse
          Wetzel's Climbing Mouse
          Wetzel's Climbing Mouse is a species of rodent in the family Cricetidae.It is found only in Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Rhipidomys wetzeli
      • Genus Thomasomys
        Thomasomys
        Thomasomys is a genus of rodent in the family Cricetidae, named after British zoologist Oldfield Thomas. It contains the following species:* Anderson's Oldfield Mouse * Apeco Oldfield Mouse...
        
        - Oldfield Mice
        • Anderson's Oldfield Mouse, Thomasomys andersoni
        • Apeco Oldfield Mouse
          Apeco oldfield mouse
          The Apeco oldfield mouse is a species of rodent in the family Cricetidae. It is known only from a single locality in north central Peru, which includes Rio Abiseo National Park, where it was found in cloud forest at an elevation of 3300 m. The species name comes from the acronym for the . It is...
          
          , Thomasomys apeco
        • Golden Oldfield Mouse
          Golden Oldfield Mouse
          The Golden Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Colombia, Ecuador, Peru, and Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys aureus
        • Beady-eyed Mouse
          Beady-eyed Mouse
          The Beady-eyed Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Thomasomys baeops
        • Silky Oldfield Mouse
          Silky Oldfield Mouse
          The Silky Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Colombia.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys bombycinus
        • White-tipped Oldfield Mouse
          White-tipped oldfield mouse
          The white-tipped oldfield mouse is a species of rodent in the family Cricetidae. It is found in the Andes from central Ecuador to northern Peru, at elevations from 2500 to 3350 m, where it lives in montane forest....
          
          , Thomasomys caudivarius
        • Ashy-bellied Oldfield Mouse
          Ashy-bellied Oldfield Mouse
          The Ashy-bellied Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Colombia and Ecuador.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Thomasomys cinereiventer
        • Ash-colored Oldfield Mouse
          Ash-colored Oldfield Mouse
          The Ash-colored Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Thomasomys cinereus
        • Cinnamon-colored Oldfield Mouse
          Cinnamon-colored oldfield mouse
          The cinnamon-colored oldfield mouse , also called the "cinnamon-colored Thomasomys", is a species of rodent in the family Cricetidae. It is present in the Cordillera Oriental of the Andes from north central Ecuador to southern Colombia, at elevations from 2400 to 3800 m. It has terrestrial habits,...
          
          , Thomasomys cinnameus
        • Daphne's Oldfield Mouse
          Daphne's Oldfield Mouse
          Daphne's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Bolivia and Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys daphne
        • Peruvian Oldfield Mouse
          Peruvian Oldfield Mouse
          The Peruvian Oldfield Mouse is a species of rodent in the family Cricetidae. It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys eleusis
        • Wandering Oldfield Mouse
          Wandering oldfield mouse
          The wandering oldfield mouse , also called the "wandering Thomasomys", is a species of rodent in the family Cricetidae. It has been found in both the Cordillera Oriental and Cordillera Occidental of the Andes in central and north central Ecuador, at elevations from 2400 to 3600 m...
          
          , Thomasomys erro
        • Slender Oldfield Mouse
          Slender Oldfield Mouse
          The Slender Oldfield Mouse is a species of rodent in the family Cricetidae. It is found in Ecuador and Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys gracilis
        • Hudson's Oldfield Mouse
          Hudson's oldfield mouse
          Hudson's oldfield mouse is a species of rodent in the family Cricetidae. It is known only from the Andes in southern Ecuador, where is has been found at an elevation of 3100 m. It was formerly considered a subspecies of T. gracilis. It is named after American zoologist Wilfred Hudson Osgood....
          
          , Thomasomys hudsoni
        • Woodland Oldfield Mouse
          Woodland Oldfield Mouse
          The Woodland Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Colombia and Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys hylophilus
        • Inca Oldfield Mouse
          Inca Oldfield Mouse
          The Inca Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys incanus
        • Strong-tailed Oldfield Mouse
          Strong-tailed Oldfield Mouse
          The Strong-tailed Oldfield Mouse is a species of rodent in the family Cricetidae. It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Thomasomys ischyrus
        • Kalinowski's Oldfield Mouse
          Kalinowski's Oldfield Mouse
          Kalinowski's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys kalinowskii
        • Ladew's Oldfield Mouse
          Ladew's Oldfield Mouse
          Ladew's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Bolivia.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys ladewi
        • Soft-furred Oldfield Mouse
          Soft-furred Oldfield Mouse
          The Soft-furred Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Colombia and Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys laniger
        • Large-eared Oldfield Mouse
          Large-eared oldfield mouse
          The large-eared oldfield mouse is a species of rodent in the family Cricetidae. It is known only from a single locality in the Andes in north central Peru , in montane forest at an elevation of 3300 m. It has terrestrial habits and is sympatric with T. apeco....
          
          , Thomasomys macrotis
        • Unicolored Oldfield Mouse
          Unicolored Oldfield Mouse
          The Unicolored Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Colombia.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys monochromos
        • Snow-footed Oldfield Mouse
          Snow-footed Oldfield Mouse
          The Snow-footed Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Colombia.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Thomasomys niveipes
        • Distinguished Oldfield Mouse
          Distinguished Oldfield Mouse
          The Distinguished Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys notatus
        • Ashaninka Oldfield Mouse
          Ashaninka oldfield mouse
          The Ashaninka oldfield mouse is a species of rodent in the family Cricetidae. It is known only from a single locality in the Cordillera Oriental of the southern Peruvian Andes, in montane forest at an elevation of 3350 m. It has terrestrial habits...
          
          , Thomasomys onkiro
        • Montane Oldfield Mouse
          Montane Oldfield Mouse
          The Montane Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Bolivia.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys oreas
        • Paramo Oldfield Mouse
          Paramo Oldfield Mouse
          The Paramo Oldfield Mouse is a species of rodent in the family Cricetidae. A youth or baby of a Paramo Oldfield mouse is called a 'pinkie', 'kitten' or 'pup'. The females are called 'does' and males 'bucks'...
          
          , Thomasomys paramorum
        • Popayán Oldfield Mouse
          Popayán oldfield mouse
          The Popayán oldfield mouse , also called the "Popayán Thomasomys", is a species of rodent in the family Cricetidae. It is present in the Andes of southwestern and central western Colombia, at elevations from 1800 to 3200 m. It has been found in páramo, montane forest, and secondary forest. It was...
          
          , Thomasomys popayanus
        • Cajamarca Oldfield Mouse
          Cajamarca oldfield mouse
          The Cajamarca oldfield mouse is a species of rodent in the family Cricetidae. It is present in the Andes of northwestern Peru, where its habitats include shrubby páramo, montane forest, and secondary forest. The rodent is nocturnal and may be partly arboreal. It was formerly considered a...
          
          , Thomasomys praetor
        • Thomas's Oldfield Mouse
          Thomas's Oldfield Mouse
          Thomas's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys pyrrhonotus
        • Rhoads's Oldfield Mouse
          Rhoads's Oldfield Mouse
          Rhoads's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys rhoadsi
        • Rosalinda's Oldfield Mouse
          Rosalinda's Oldfield Mouse
          Rosalinda's Oldfield Mouse is a species of rodent in the family Cricetidae. It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys rosalinda
        • Forest Oldfield Mouse
          Forest Oldfield Mouse
          The Forest Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys silvestris
        • Taczanowski's Oldfield Mouse
          Taczanowski's Oldfield Mouse
          Taczanowski's Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys taczanowskii
        • Ucucha Oldfield Mouse
          Ucucha oldfield mouse
          Thomasomys ucucha, also known as the Ucucha Thomasomys, is a rodent in the genus Thomasomys of the family Cricetidae. Found only in the Cordillera Oriental of Ecuador, a mountain range, it lives in forests and grasslands at 3380 to 3720 m above sea level. It may occur with seven other species...
          
          , Thomasomys ucucha
        • Dressy Oldfield Mouse
          Dressy Oldfield Mouse
          The Dressy Oldfield Mouse is a species of rodent in the family Cricetidae.It is found only in Venezuela.-References:* Baillie, J. 1996. . Downloaded on 20 July 2007....
          
          , Thomasomys vestitus
        • Pichincha Oldfield Mouse
          Pichincha oldfield mouse
          The Pichincha oldfield mouse is a species of rodent in the family Cricetidae. It is present in the Cordillera Occidental of the Andes of Ecuador, where its habitats include shrubby páramo and montane forest. It is nocturnal and terrestrial...
          
          , Thomasomys vulcani
      • Genus Wilfredomys - Wilfred's Mice
        • Greater Wilfred's Mouse
          Greater Wilfred's Mouse
          The Greater Wilfred's Mouse, Wilfredomys oenax, is a rodent species from South America. It is found in southern Brazil and Uruguay in subtropical lowland forest. It is arboreal to some degree. It is the only species in the genus Wilfredomys....
          
          , Wilfredomys oenax
    • Tribe Wiedomyini
      • Genus Cholomys †
        • Cholomys pearsoni †
      • Genus Wiedomys
        Wiedomys
        Wiedomys is a genus of South American rodents in the family Cricetidae.It contains the following species:* Cerrado Red-nosed Mouse * Red-nosed Mouse...
        
        - Red-nosed Mouse
        • Cerrado Red-nosed Mouse
          Cerrado red-nosed mouse
          The cerrado red-nosed mouse, Wiedomys cerradensis, is a rodent species from South America. It is known from one locality in Bahia, eastern Brazil. The species was found in semi-deciduous forest in the cerrado ecoregion....
          
          , Wiedomys cerradensis
        • Red-nosed Mouse
          Red-nosed Mouse
          The Red-nosed Mouse, Wiedomys pyrrhorhinos, is an arboreal rodent species from South America. It is found in caatinga and cerrado habitat in eastern Brazil....
          
          , Wiedomys pyrrhorhinos
    • Tribe Abrotrichini
      Abrotrichini
      Abrotrichini, also known as the Andean clade or southern Andean clade, is a tribe of rodents in the subfamily Sigmodontinae. It includes about fifteen species in five genera, distributed in South America from southern Peru to southernmost South America, including the Patagonian steppes...
      
      
      • Genus Abrothrix
        Abrothrix
        Abrothrix is a genus of rodent in the tribe Abrotrichini of family Cricetidae.It contains the following living species:*Abrothrix andinus*Abrothrix hershkovitzi*Abrothrix illuteus*Abrothrix jelskii*Abrothrix lanosus...
        
        
        • Andean Altiplano Mouse
          Andean Altiplano Mouse
          Abrothrix andinus, also known as the Andean Altiplano Mouse or Andean Akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found in the altiplano habitat of the Andes from central Peru through Bolivia south to Argentina and Chile.-Literature cited:*Musser, G.G. and...
          
          , Abrothrix andinus
        • Hershkovitz's Grass Mouse
          Hershkovitz's Grass Mouse
          Abrothrix hershkovitzi, also known as Hershkovitz's Grass Mouse or Hershkovitz's Akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found only on some remote islands in southern Chile. It is named after American zoologist Philip Hershkovitz.-Literature...
          
          , Abrothrix hershkovitzi
        • Gray Grass Mouse
          Gray Grass Mouse
          Abrothrix illuteus, also known as the Gray Akodont or Gray Grass Mouse, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found only in northwestern Argentina.-Literature cited:...
          
          , Abrothrix illuteus
        • Jelski's Altiplano Mouse
          Jelski's Altiplano Mouse
          Abrothrix jelskii, also known as Jelski's Altiplano Mouse, Jelski's Grass Mouse, or the Ornate Akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found in the altiplano habitat of the Andes from central Peru through Bolivia into northwestern Argentina. Populations...
          
          , Abrothrix jelskii
        • Woolly Grass Mouse
          Woolly Grass Mouse
          Abrothrix lanosus, also known as the Woolly Grass Mouse or Woolly Akodont, is a species of rodent in the family Cricetidae.It is found in southern Argentina and Chile. It was previously classified in the genus Akodon rather than Abrothrix.-Literature cited:*Musser, G.G. and Carleton, M.D. 2005....
          
          , Abrothrix lanosus
        • Long-haired Grass Mouse
          Long-haired Grass Mouse
          Abrothrix longipilis, also known as the Long-haired Grass Mouse or Long-haired Akodont, is a species of rodent in the family Cricetidae....
          
          , Abrothrix longipilis
        • Olive Grass Mouse
          Olive Grass Mouse
          Abrothrix olivaceus, also known as the Olive Grass Mouse or Olive Akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found from northern Chile into southern Chile and Argentina, including the island of Tierra del Fuego. It has had a complex history in both of the...
          
          , Abrothrix olivaceus
        • Sanborn's Grass Mouse
          Sanborn's Grass Mouse
          Abrothrix sanborni, also known as Sanborn's Grass Mouse or Sanborn's Akodont, is a species of rodent in the genus Abrothrix of family Cricetidae. It is found in southern Argentina and Chile, but may not be distinct from A. longipilis....
          
          , Abrothrix sanborni
      • Genus Chelemys
        Chelemys
        Chelemys is a genus of South American rodents in the tribe Abrotrichini of family Cricetidae. Three species—Chelemys delfini, Chelemys macronyx, and Chelemys megalonyx—are known, all found in central and southern Chile and Argentina....
        
        - Long-clawed Mice
        • Magellanic Long-clawed Akodont, Chelemys delfini
        • Andean Long-clawed Mouse
          Andean Long-Clawed Mouse
          Chelemys macronyx, also known as the Andean Long-clawed Mouse or Andean Long-clawed Akodont, is a species of rodent in the genus Chelemys of family Cricetidae. It is found in Argentina and Chile.-Literature cited:...
          
          , Chelemys macronyx
        • Large Long-clawed Mouse
          Large Long-Clawed Mouse
          Chelemys megalonyx, also known as the Large Long-clawed Mouse or Large Long-clawed Akodont is a species of rodent in the genus Chelemys of family Cricetidae. It is endemic to central Chile.-Literature cited:...
          
          , Chelemys megalonyx
      • Genus Geoxus - Long-clawed Mole Mouse
        • Long-clawed Mole Mouse
          Long-Clawed Mole Mouse
          Geoxus valdivianus, also known as the Long-clawed Mole Mouse or Valdivian Long-clawed Akodont, is a species of rodent in the tribe Abrotrichini of family Cricetidae found in the Valdivian temperate rain forests and Magellanic subpolar forests of Argentina and Chile. It is the only species in the...
          
          , Geoxus valdivianus
      • Genus Notiomys - Edward's Long-clawed Mouse
        • Edwards's Long-clawed Mouse, Notiomys edwardsii
      • Genus Pearsonomys - Pearson's Long-clawed Akodont
        • Pearson's Long-clawed Mouse
          Pearson's Long-clawed Mouse
          Pearsonomys annectens, also known as Pearson's Long-clawed Akodont or Pearson's Long-clawed Mouse, is a species of rodent in the tribe Abrotrichini of family Cricetidae, named after American zoologist . It is the only species in the genus Pearsonomys.It is found only in Chile.-Literature...
          
          , Pearsonomys annectens
    • Tribe Akodontini
      Akodontini
      Akodontini is the second most speciose tribe of the subfamily Sigmodontinae. It includes at least 106 living species in 19 genera and is distributed mainly in the southern half of South America, with only two genera extending into Guyana and Venezuela . It also includes genera previously placed in...
      
      
      • Genus Akodon
        Akodon
        Akodon is a genus consisting of South American grass mice. They mostly occur south of the Amazon Basin and along the Andes north to Venezuela, but are absent from much of the basin itself, the far south of the continent, and the lowlands west of the Andes. Akodon is one of the most species-rich...
        
        - South American Grass Mice
        • Highland Grass Mouse
          Highland Grass Mouse
          Akodon aerosus, also known as the Highland Grass Mouse or Yungas Akodont, is a species of rodent in the family Cricetidae.It is found in the eastern Andes from eastern Ecuador through Peru into central Bolivia.-Literature cited:...
          
          , Akodon aerosus
        • Colombian Grass Mouse
          Colombian Grass Mouse
          Akodon affinis, also known as the Colombian Grass Mouse or Cordillera Occidental Akodont, is a species of rodent in the family Cricetidae.It is found only in the Cordillera Occidental of Colombia.-Literature cited:...
          
          , Akodon affinis
        • White-bellied Grass Mouse
          White-bellied Grass Mouse
          Akodon albiventer, also known as the White-bellied Grass Mouse or White-bellied Akodont, is a species of rodent in the family Cricetidae...
          
          , Akodon albiventer
        • Azara's Grass Mouse
          Azara's Grass Mouse
          Akodon azarae, also known as Azara's Akodont or Azara's Grass Mouse, is a rodent species from South America. It is found from southernmost Brazil through Paraguay and Uruguay into eastern Argentina. It is named after Spanish naturalist Félix de Azara.-Literature cited:*D'Elia, G. and Pardinas, U....
          
          , Akodon azarae
        • Bogotá Grass Mouse
          Bogota Grass Mouse
          Akodon bogotensis, also known as the Bogotá Grass Mouse or Bogotá Akodont, is a species of rodent in the family Cricetidae.It is found in the Andes eastern and central Colombia and northwestern Venezuela.-Literature cited:...
          
          , Akodon bogotensis
        • Bolivian Grass Mouse
          Bolivian Grass Mouse
          Akodon boliviensis, also known as the Bolivian Grass Mouse or Bolivian Akodont, is a species of rodent in the family Cricetidae. It is found in the Andes from southeastern Peru through Bolivia into northwestern Argentina.-Literature cited:...
          
          , Akodon boliviensis
        • Budin's Grass Mouse
          Budin's Grass Mouse
          Akodon budini, also known as Budin's Akodont or Budin's Grass Mouse, is a species of rodent in the family Cricetidae. It is found in the Andes of northwestern Argentina and adjacent Bolivia. The species is named after Emilio Budin, an Argentine specimen collector who worked with Oldfield...
          
          , Akodon budini
        • Akodon caenosus
        • Cursor Grass Mouse
          Cursor Grass Mouse
          The Cursor Grass Mouse or Cursorial Akodont , is a rodent species from South America. It is found in Argentina and Brazil....
          
          , Akodon cursor
        • Day's Grass Mouse
          Day's Grass Mouse
          Day's Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Bolivia....
          
          , Akodon dayi
        • Dolorous Grass Mouse
          Dolorous Grass Mouse
          The Dolorous Grass Mouse or Córdoba Akodont is a species of rodent in the family Cricetidae.It is found only in Argentina....
          
          , Akodon dolores
        • Smoky Grass Mouse
          Smoky Grass Mouse
          The Smoky Grass Mouse is a species of rodent in the family Cricetidae. It is found in Argentina, Bolivia and Peru....
          
          , Akodon fumeus
        • Akodon glaucinus
        • Intelligent Grass Mouse
          Intelligent Grass Mouse
          The Intelligent Grass Mouse or Patagonian Akodont is a species of rodent in the family Cricetidae.It is found in Argentina and Chile.-Bibliography:...
          
          , Akodon iniscatus
        • Junín Grass Mouse
          Junin Grass Mouse
          The Junín Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:...
          
          , Akodon juninensis
        • Koford's Grass Mouse
          Koford's Grass Mouse
          Koford's Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Peru. It is named after American biologist Carl B. Koford.-References:...
          
          , Akodon kofordi
        • Ecuadorian Grass Mouse
          Ecuadorian Grass Mouse
          The Ecuadorian Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador....
          
          , Akodon latebricola
        • Lindbergh's Grass Mouse
          Lindbergh's Grass Mouse
          Lindbergh's Grass Mouse, Akodon lindberghi, is a rodent species from South America. It is found in Brazil.-References:**Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. Pp. 894-1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds....
          
          , Akodon lindberghi
        • Altiplano Grass Mouse
          Altiplano Grass Mouse
          The Altiplano Grass Mouse is a species of rodent in the family Cricetidae.It is found in Bolivia, and Peru.-References:...
          
          , Akodon lutescens
        • Thespian Grass Mouse
          Thespian Grass Mouse
          The Thespian Grass Mouse or Hocicudo-like Akodont is a species of rodent in the family Cricetidae.It is found in Bolivia and Peru....
          
          , Akodon mimus
        • Molina's Grass Mouse, Akodon molinae
        • Soft Grass Mouse
          Soft Grass Mouse
          The Soft Grass Mouse is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru....
          
          , Akodon mollis
        • Montane Grass Mouse
          Montane Grass Mouse
          The Montane Grass Mouse, Akodon montensis, is a rodent species from South America. It is found in Argentina, Brazil, Paraguay and Uruguay.-References:*...
          
          , Akodon montensis
        • Caparaó Grass Mouse
          Caparaó Grass Mouse
          The Caparaó Grass Mouse, Akodon mystax, is a rodent species from South America. It is found in Brazil....
          
          , Akodon mystax
        • Neuquén Grass Mouse
          Neuquen Grass Mouse
          The Neuquén Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Argentina....
          
          , Akodon neocenus
        • El Dorado Grass Mouse
          El Dorado Grass Mouse
          The El Dorado Grass Mouse or Utcubamba Akodont is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru....
          
          , Akodon orophilus
        • Paraná Grass Mouse
          Paraná Grass Mouse
          The Paraná Grass Mouse, Akodon paranaensis, is a South American rodent species of the family Cricetidae. It is found in northeastern Argentina and southeastern Brazil.-References:*...
          
          , Akodon paranaensis
        • Tarija Akodont
          Tarija Akodont
          The Tarija Akodont is a species in the family Cricetidae native to Bolivia, and possibly Argentina....
          
          , Akodon pervalens
        • Philip Myers' Akodont, Akodon philipmyersi
        • Akodon polopi
        • Reig's Grass Mouse
          Reig's Grass Mouse
          Reig's Grass Mouse, Akodon reigi, is a South American rodent species found in Brazil and Uruguay. It is named after Argentine biologist Osvaldo Reig .-References:*...
          
          , Akodon reigi
        • São Paulo Grass Mouse
          Sao Paulo Grass Mouse
          The São Paulo Grass Mouse, Akodon sanctipaulensis, is a rodent species from South America. It is found in Brazil.-References:**Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M....
          
          , Akodon sanctipaulensis
        • Serra do Mar Grass Mouse, Akodon serrensis
        • Cochabamba Grass Mouse
          Cochabamba Grass Mouse
          The Cochabamba Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Bolivia.Its natural habitat is subtropical or tropical moist lowland forests.-Source:...
          
          , Akodon siberiae
        • White-throated Grass Mouse
          White-throated Grass Mouse
          The White-throated or Grey-bellied Grass Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Bolivia.-References:...
          
          , Akodon simulator
        • Spegazzini's Grass Mouse
          Spegazzini's Grass Mouse
          Akodon spegazzinii, also known as Spegazzini's Akodont or Spegazzini's Grass Mouse, is a rodent in the genus Akodon found in northwestern Argentina. It occurs in grassland and forest at 400 to 3500 m above sea level...
          
          , Akodon spegazzinii
        • Puno Grass Mouse
          Puno Grass Mouse
          The Puno Grass Mouse is a species of rodent in the family Cricetidae.It is found in Bolivia and Peru.-References:...
          
          , Akodon subfuscus
        • Silent Grass Mouse
          Silent Grass Mouse
          The Silent Grass Mouse or Slate-bellied Akodont is a species of rodent in the family Cricetidae. It is found only in Peru.-References:...
          
          , Akodon surdus
        • Forest Grass Mouse
          Forest Grass Mouse
          Akodon sylvanus, also known as the Forest Grass Mouse or Woodland Akodont, is a species of rodent in the family Cricetidae.It is found only in a small part of northwestern Argentina.-References:...
          
          , Akodon sylvanus
        • Akodon tartareus
        • Chaco Grass Mouse
          Chaco Grass Mouse
          The Chaco Grass Mouse is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, and Paraguay.-References:...
          
          , Akodon toba
        • Cloud Forest Grass Mouse
          Cloud Forest Grass Mouse
          The Cloud Forest Grass Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:...
          
          , Akodon torques
        • Variable Grass Mouse
          Variable Grass Mouse
          The Variable Grass Mouse is a species of rodent in the family Cricetidae. It is known only from Bolivia, where it is found at elevations from 400 to 3000 m.-References:...
          
          , Akodon varius
      • Genus Bibimys
        Bibimys
        Bibimys is a genus of new world rats. Commonly known as the crimson-nosed rats, there are three species:*Bibimys chacoensis - Chaco Crimson-nosed Rat - found in north-east Argentina...
        
        - Crimson-nosed Rats
        • Chaco Crimson-nosed Rat, Bibimys chacoensis
        • Large-lipped Crimson-nosed Rat, Bibimys labiosus
        • Torres' Crimson-nosed Rat, Bibimys torresi
      • Genus Blarinomys - Brazilian Shrew-Mouse
        • Brazilian Shrew-mouse
          Brazilian Shrew-mouse
          Blarinomys breviceps, also known as the Brazilian Shrew-mouse or the Blarinine Akodont, is a rodent in the tribe Akodontini from the Atlantic Forest of eastern and southeastern Brazil. It is the only species in the genus Blarinomys....
          
          , Blarinomys breviceps
      • Genus Brucepattersonius
        • Grey-bellied Brucie, Brucepattersonius griserufescens
        • Guaraní Brucie
          Guaraní brucie
          Brucepattersonius guarani, also known as the Guaraní Akodont or Guaraní Brucie, is a South American rodent in the genus Brucepattersonius. It is known from a single specimen from Misiones Province in northeastern Argentina, at the southern end of the Atlantic Forest.-Literature cited:*Duff, A. and...
          
          , Brucepattersonius guarani
        • Red-bellied Brucie
          Red-bellied Brucie
          Brucepattersonius igniventris, also known as the Red-bellied Akodont or Red-bellied Brucie, is a South American rodent in the genus Brucepattersonius. It is known only from Iporanga, São Paulo, Brazil.-Literature cited:...
          
          , Brucepattersonius igniventris
        • Ihering's Hocicudo
          Ihering's Hocicudo
          Brucepattersonius iheringi, also known as Ihering's Akodont, Ihering's Hocicudo, or Ihering's Brucie, is a South American rodent in the genus Brucepattersonius. It occurs in Santa Catarina and Rio Grande do Sul, southern Brazil, and nearby Misiones Province, Argentina.-Literature cited:*Christoff,...
          
          , Brucepattersonius iheringi
        • Misiones Brucie
          Misiones brucie
          Brucepattersonius misionensis, also known as the Misiones Akodont or Misiones Brucie, is a rodent species from South America in the genus Brucepattersonius. It is known from a single individual collected in Misiones Province in northeastern Argentina. Its taxonomic status remains to be determined...
          
          , Brucepattersonius misionensis
        • Arroyo of Paradise Brucie
          Arroyo of Paradise brucie
          The Arroyo of Paradise brucie, Brucepattersonius paradisus, is a South American rodent species of the family Cricetidae. It is known only from northeastern Argentina....
          
          , Brucepattersonius paradisus
        • Soricine Brucie
          Soricine Brucie
          The Soricine Brucie, Brucepattersonius soricinus, is a rodent species from South America. It is found in Brazil....
          
          , Brucepattersonius soricinus
      • Genus Deltamys - Kemp's Grass Mouse
        • Kemp's Grass Mouse
          Kemp's Grass Mouse
          Kemp's Grass Mouse is a species of rodent in the family Cricetidae. It is the only species in the genus Deltamys.It is found in Argentina, Brazil and Uruguay....
          
          , Deltamys kempi
      • Genus Juscelinomys
        Juscelinomys
        Juscelinomys is a genus of burrowing mice. The name is derived from Brazilian president Juscelino Kubitschek de Oliveira who created the city of Brasilia where the Brasilia Burrowing Mouse was discovered.There are two living species:...
        
        - Burrowing Mice
        • Brasilia Burrowing Mouse, Juscelinomys candango †
        • Rio Guaporé mouse
          Rio Guaporé mouse
          The Rio Guaporé mouse, Juscelinomys guaporensis, is a rodent species in the family Cricetidae. It is known only from a small savanna in eastern Bolivia near the Rio Guaporé.-References:**...
          
          , Juscelinomys guaporensis
        • Huanchaca mouse
          Huanchaca mouse
          The Huanchaca mouse, Juscelinomys huanchacae, is a rodent species in the family Cricetidae. It is known from savannas in an area at an elevation of 700 m in Serrania Huanchaca, Parque Nacional Noel Kempff Mercado in eastern Bolivia.-References:*...
          
          , Juscelinomys huanchacae
      • Genus Kunsia
        Kunsia
        Kunsia is the genus of giant rats. There are two South American species, both of which are classified as vulnerable by IUCN:*K. fronto *K. tomentosus...
        
        - Giant Rats
        • Fossorial Giant Rat
          Fossorial Giant Rat
          The Fossorial Giant Rat is a species of rodent in the family Cricetidae. It is found in Argentina and Brazil. Its natural habitat is dry savanna....
          
          , Kunsia fronto
        • Woolly Giant Rat
          Woolly Giant Rat
          The Woolly Giant Rat, Kunsia tomentosus, is a burrowing rodent species from South America. It is found in wet grasslands in Bolivia and Brazil, where it feeds on roots and grasses. They prefer elevations from sea level to about one thousand metres above sea level. They create burrows in which to...
          
          , Kunsia tomentosus
      • Genus Lenoxus - Andean Rat
        • Andean Rat
          Andean Rat
          The Andean Rat is the only species in the genus Lenoxus. It is a rodent in the tribe Akodontini found on the eastern slopes of the Andes of eastern Peru and western Bolivia....
          
          , Lenoxus apicalis
      • Genus Necromys
        Necromys
        Necromys is a genus of South American sigmodontine rodents allied to Akodon. This genus has also been known as Cabreramys or more recently Bolomys. N. urichi has recently been transferred from Akodon....
        
        - Bolo Mice
        • Pleasant Bolo Mouse
          Pleasant Bolo Mouse
          The Pleasant Bolo Mouse is a species of rodent in the family Cricetidae. It is found in Bolivia and Peru.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Necromys amoenus
        • Argentine Bolo Mouse
          Argentine bolo mouse
          The Argentine bolo mouse is a species of rodent in the family Cricetidae. It is endemic to central Argentina, where it is found in the pampas and the drier espinal ....
          
          , Necromys benefactus
        • Rufous-bellied Bolo Mouse
          Rufous-bellied Bolo Mouse
          The Rufous-bellied Bolo Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Bolivia.-References:* Dunnum, J., Vargas, J., Bernal, N. & Jayat, J.P. 2008. . Downloaded on 18 April 2009....
          
          , Necromys lactens
        • Hairy-tailed Bolo Mouse
          Hairy-tailed Bolo Mouse
          The Hairy-tailed Bolo Mouse, Necromys lasiurus, is a rodent species from South America. It is found in Argentina, Bolivia, Brazil and Paraguay.-References:*...
          
          , Necromys lasiurus
        • Paraguayan Bolo Mouse
          Paraguayan bolo mouse
          The Paraguayan bolo mouse is a species of rodent in the family Cricetidae. It is known from Bolivia, Paraguay and Peru, and may be present in Argentina and Brazil. It is found at elevations from 300 to 2030 m in a variety of habitats, including cerrado, chaco and heath pampas....
          
          , Necromys lenguarum
        • Dark Bolo Mouse
          Dark Bolo Mouse
          The Dark Bolo Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Uruguay.-References:* D'elia, G., Pardinas, U., Jayat, J.P., Teta, P. & Patterson., B. 2008. . Downloaded on 19 April 2009....
          
          , Necromys obscurus
        • Spotted Bolo Mouse
          Spotted Bolo Mouse
          The Spotted Bolo Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador.-References:...
          
          , Necromys punctulatus
        • Temchuk's Bolo Mouse
          Temchuk's Bolo Mouse
          Temchuk's Bolo Mouse is a species of rodent in the family Cricetidae.It is found only in Argentina.-References:* Pardinas, U., D'Elia, G. & Teta, P. 2008. . Downloaded on 19 April 2009....
          
          , Necromys temchuki
        • Northern Grass Mouse
          Northern Grass Mouse
          The Northern Grass Mouse is a species of rodent in the family Cricetidae.It is found in Brazil, Colombia, Trinidad and Tobago, and Venezuela.-References:...
          
          , Necromys urichi
      • Genus Oxymycterus
        Oxymycterus
        Oxymycterus is the genus of hocicudos. They are rat-like animals endemic to South America.Species listing:Oxymycterus is the genus of hocicudos. They are rat-like animals endemic to South America.Species listing:...
        
        - Hocicudos
        • Argentine Hocicudo
          Argentine Hocicudo
          The Argentine Hocicudo is a species of rodent in the family Cricetidae.It is found only in northern Argentina in yungas habitat.-References:...
          
          , Oxymycterus akodontius
        • Amazon Hocicudo, Oxymycterus amazonicus
        • Angular Hocicudo
          Angular Hocicudo
          The Angular Hocicudo, Oxymycterus angularis, is a rodent species from South America. It is found in Brazil....
          
          , Oxymycterus angularis
        • Caparao Hocicudo
          Caparaó Hocicudo
          The Caparaó Hocicudo, Oxymycterus caparoae, is a rodent species from South America. It is found in Brazil.-References:*...
          
          , Oxymycterus caparaoe
        • Atlantic Forest Hocicudo
          Atlantic Forest hocicudo
          The Atlantic Forest hocicudo is a species of rodent in the family Cricetidae.It is found only in southeastern Brazil, where it lives in the Atlantic Forest and associated wetlands at altitudes from sea level to 800 m....
          
          , Oxymycterus dasytrichus
        • Spy Hocicudo
          Spy Hocicudo
          The Spy Hocicudo is a species of rodent in the family Cricetidae.It is found only in Paraguay.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Oxymycterus delator
        • Small Hocicudo
          Small Hocicudo
          The Small Hocicudo is a species of rodent in the family Cricetidae.It is found in Bolivia and Peru on the eastern slopes of the Andes at elevations from 610 to 3500 m.-References:...
          
          , Oxymycterus hiska
        • Hispid Hocicudo
          Hispid Hocicudo
          The Hispid Hocicudo, Oxymycterus hispidus, is a rodent species from South America. It is found in Argentina and Brazil, in the Atlantic Forest....
          
          , Oxymycterus hispidus
        • Quechuan Hocicudo
          Quechuan Hocicudo
          Oxymycterus hucucha, also known as the Quechuan Hocicudo, is a species of rodent in the genus Oxymycterus of family Cricetidae from South America. It is found only in a small region of the Andes in central Bolivia, where it lives in cloud forest at altitudes from 2600 to 3000 m.Exceptionally small...
          
          , Oxymycterus hucucha
        • Incan Hocicudo
          Incan Hocicudo
          The Incan Hocicudo is a species of rodent in the family Cricetidae.It is found in Bolivia and Peru.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Oxymycterus inca
        • Cook's Hocicudo
          Cook's hocicudo
          Cook's hocicudo is a species of rodent in the family Cricetidae. It is found only in southern Uruguay, where it lives in wetlands, moist grasslands and scrub. The specifies is named after American zoologist Joseph “José” A. Cook....
          
          , Oxymycterus josei
        • Long-nosed Hocicudo
          Long-nosed Hocicudo
          The Long-nosed Hocicudo, Oxymycterus nasutus, is a South American rodent species found in southeastern Brazil and Uruguay. It hunts grubs and worms under the cover of leaves, logs, and stones. It has a long, flexible nose, and usually utilizes the tunnels and pathways created by other...
          
          , Oxymycterus nasutus
        • Paramo Hocicudo
          Paramo Hocicudo
          The Paramo Hocicudo is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, and Peru.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Oxymycterus paramensis
        • Quaestor Hocicudo
          Quaestor hocicudo
          The quaestor hocicudo is a species of rodent in the family Cricetidae. It is found in southeastern Brazil and northeastern Argentina, where it lives in forest and moist and dry scrub....
          
          , Oxymycterus quaestor
        • Robert's Hocicudo
          Robert's Hocicudo
          Robert's Hocicudo, Oxymycterus roberti, is a rodent species from South America. It is found in Brazil and Paraguay....
          
          , Oxymycterus roberti
        • Red Hocicudo
          Red Hocicudo
          The Red Hocicudo, Oxymycterus rufus, is a rodent species from South America. It is found in Argentina, Brazil and Uruguay....
          
          , Oxymycterus rufus
        • Oxymycterus wayku
      • Genus Podoxymys - Roraima Mouse
        • Roraima Mouse
          Roraima Mouse
          The Roraima Mouse is a species of rodent in the family Cricetidae. It is the only species in the genus Podoxymys.It is found only in Guyana.-References:...
          
          , Podoxymys roraimae
      • Genus Scapteromys
        Scapteromys
        Scapteromys is a genus of South American rodents in the tribe Akodontini of family Cricetidae. Two species are known, found in northern Argentina, southern Brazil, Paraguay and Uruguay...
        
        - Swamp Rat
        • Argentine Swamp Rat
          Argentine swamp rat
          The Argentine swamp rat, Scapteromys aquaticus, is a semiaquatic rodent species from South America. It is found in northeastern Argentina and Paraguay, where it lives in freshwater marshes and along the southern coast of the Río de la Plata estuary, as well as in forests.-References:*...
          
          , Scapteromys aquaticus
        • Waterhouse's Swamp Rat
          Waterhouse's Swamp Rat
          Waterhouse's Swamp Rat, Scapteromys tumidus, is a semiaquatic rodent species from South America. It is found in southern Brazil, Uruguay and northern Argentina, where it lives in freshwater and salt marshes, as well as open grassland of the pampas....
          
          , Scapteromys tumidus
      • Genus Thalpomys
        Thalpomys
        Thalpomys is a genus of South American rodents in the tribe Akodontini of family Cricetidae. Two species are known, both found in the cerrado tropical savanna ecoregion of central Brazil. They are as follows:* Cerrado Mouse...
        
        - Cerrado Mice
        • Cerrado Mouse
          Cerrado Mouse
          The Cerrado Mouse, Thalpomys cerradensis, is a rodent species from South America. It is found in Brazil....
          
          , Thalpomys cerradensis
        • Hairy-eared Cerrado Mouse
          Hairy-eared Cerrado Mouse
          The Hairy-eared Cerrado Mouse, Thalpomys lasiotis, is a rodent species from South America. It is found in Brazil....
          
          , Thalpomys lasiotis
      • Genus Thaptomys - Ebony Akodont
        • Blackish Grass Mouse
          Blackish Grass Mouse
          The Blackish Grass Mouse, Thaptomys nigrita, also formerly called the Ebony Akodont, is a rodent species from South America. It is found in Argentina, Brazil, Paraguay and Uruguay. It is the only species in the genus Thaptomys....
          
          , Thaptomys nigrita
    • Tribe Phyllotini
      • Genus Andalgalomys
        Andalgalomys
        Andalgalomys is a genus of rodent in the family Cricetidae.It contains the following species:* Olrog's Chaco Mouse * Pearson's Chaco Mouse * Roig's Chaco Mouse...
        
        - Chaco Mice
        • Olrog's Chaco Mouse
          Olrog's Chaco Mouse
          Olrog's Chaco Mouse is a species of South American rodent in the family Cricetidae, endemic to Argentina. The natural habitat of the species is hot deserts. It is named after Swedish-Argentine biologist Claes C. Olrog....
          
          , Andalgalomys olrogi
        • Pearson's Chaco Mouse
          Pearson's Chaco Mouse
          Pearson's Chaco Mouse is a species of rodent in the family Cricetidae.It is found in Bolivia and Paraguay.-References:...
          
          , Andalgalomys pearsoni
        • Roig's Chaco Mouse, Andalgalomys roigi
      • Genus Andinomys - Andean Mouse
        • Andean Mouse
          Andean Mouse
          The Andean Mouse is a species of rodent in the family Cricetidae. It is the only species in the genus Andinomys.It is found in Argentina, Bolivia, Chile, and Peru.-References:...
          
          , Andinomys edax
      • Genus Auliscomys
        Auliscomys
        Auliscomys is a genus of rodent in the family Cricetidae.It contains the following species:* Bolivian Big-eared Mouse * Painted Big-eared Mouse * Andean Big-eared Mouse...
        
        - Big-Eared Mice
        • Bolivian Big-eared Mouse
          Bolivian Big-eared Mouse
          The Bolivian Big-eared Mouse is a species of rodent in the family Muridae.It is found in Bolivia, Chile, and Peru....
          
          , Auliscomys boliviensis
        • Painted Big-eared Mouse
          Painted Big-eared Mouse
          The Painted Big-eared Mouse is a species of rodent in the family Cricetidae. It is found in Bolivia and Peru, and possibly Chile....
          
          , Auliscomys pictus
        • Andean Big-eared Mouse
          Andean Big-eared Mouse
          The Andean Big-eared Mouse is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, Chile, and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Auliscomys sublimis
      • Genus Calomys - Vesper Mice
        • Bolivian Vesper Mouse
          Bolivian Vesper Mouse
          The Bolivian Vesper Mouse is a species of rodent in the family Cricetidae. It is found in Argentina, Bolivia and perhaps Peru....
          
          , Calomys boliviae
        • Crafty Vesper Mouse
          Crafty Vesper Mouse
          The Crafty Vesper Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Paraguay.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Calomys callidus
        • Large Vesper Mouse
          Large Vesper Mouse
          The Large Vesper Mouse, Calomys callosus, is a rodent species from South America. It is found in Argentina, Bolivia, Brazil and Paraguay.It is particularly notable as the vector of Bolivian hemorrhagic fever....
          
          , Calomys callosus
        • Calomys cerqueirai
          Calomys cerqueirai
          Calomys cerqueirai is a species of rodent in the genus Calomys from southeastern Brazil. Distinct from other Calomys in its karyotype and characters of the fur, it is known only from two places in Minas Gerais...
          
          
        • Caatinga Vesper Mouse
          Caatinga vesper mouse
          The caatinga vesper mouse, Calomys expulsus, is a rodent species in the family Cricetidae from South America. It is endemic to eastern Brazil, where it is found in open savanna and thorny scrub habitats....
          
          , Calomys expulsus
        • Fecund Vesper Mouse
          Fecund vesper mouse
          The fecund vesper mouse is a species of rodent in the family Cricetidae. It is known only from Bolivia, where it is found in the yungas and Tucumano boliviano forest ecoregions at elevations from 600 to 2700 m. It is regarded by some authorities as conspecific with C. boliviae....
          
          , Calomys fecundus
        • Hummelinck's Vesper Mouse
          Hummelinck's Vesper Mouse
          Hummelinck's Vesper Mouse is a species of rodent in the family Cricetidae.It is found in Aruba, Brazil, Colombia, the Netherlands Antilles, and Venezuela.-References:...
          
          , Calomys hummelincki
        • Small Vesper Mouse
          Small Vesper Mouse
          The Small Vesper Mouse, Calomys laucha, is a rodent species from South America. It is found in Argentina, Bolivia, Brazil, Paraguay and Uruguay. It is one of the hosts of hantavirus, causing Hantavirus pulmonary syndrome...
          
          , Calomys laucha
        • Andean Vesper Mouse
          Andean Vesper Mouse
          The Andean Vesper Mouse is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, Chile, and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Calomys lepidus
        • Drylands Vesper Mouse
          Drylands Vesper Mouse
          The Drylands Vesper Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Paraguay.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Calomys musculinus
        • Peruvian Vesper Mouse
          Peruvian Vesper Mouse
          The Peruvian Vesper Mouse is a species of rodent in the family Cricetidae. It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Calomys sorellus
        • Delicate Vesper Mouse
          Delicate Vesper Mouse
          The Delicate Vesper Mouse, Calomys tener, is a South American rodent species of the family Cricetidae. It is found in Argentina, Bolivia and Brazil.- References :**...
          
          , Calomys tener
        • Tocantins Vesper Mouse
          Tocantins Vesper Mouse
          The Tocantins Vesper Mouse, Calomys tocantinsi, is a rodent species from South America. It is found in Brazil....
          
          , Calomys tocantinsi
        • Córdoba vesper mouse
          Córdoba vesper mouse
          The Córdoba vesper mouse is a South American rodent species of the family Cricetidae. It is endemic to the area of Córdoba Province, central Argentina, where it is found in the espinal ....
          
          , Calomys venustus
      • Genus Chinchillula - Altiplano Chinchilla Mouse
        • Northern Grass Mouse
          Northern Grass Mouse
          The Northern Grass Mouse is a species of rodent in the family Cricetidae.It is found in Brazil, Colombia, Trinidad and Tobago, and Venezuela.-References:...
          
          , Chinchillula sahamae
      • Genus Eligmodontia
        Eligmodontia
        The genus Eligmodontia consists of five or six species of South American sigmodontine mice restricted to Bolivia, Chile, and Argentina. Species of Eligmodontia occur along the eastern side of the Andes Mountains, in Patagonia, and in the Chaco thorn forest of South America. They can be found in...
        
        - Silky Desert Mice
        • Monte Gerbil Mouse
          Monte Gerbil Mouse
          The Monte Gerbil Mouse or Monte Laucha is a species of rodent in the family Cricetidae.It is found only in Argentina.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Eligmodontia moreni
        • Andean Gerbil Mouse
          Andean Gerbil Mouse
          The Andean Gerbil Mouse or Altiplano Laucha is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, Chile, and Peru.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Eligmodontia puerulus
        • Eligmodontia hirtipes (recently separated from Eligmodontia puerulus)
        • Morgan's Gerbil Mouse
          Morgan's Gerbil Mouse
          Morgan's Gerbil Mouse , also known as the Western Patagonian Laucha, is a species of rodent in the family Cricetidae.It is found in Argentina and Chile.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Eligmodontia morgani
        • Eastern Patagonian Laucha, Eligmodontia typus
        • Highland Gerbil Mouse
          Highland Gerbil Mouse
          Eligmodontia typus is a species of rodent in the family Cricetidae. It is found in Argentina and possibly also Chile. The northernmost population might represent a distinct species, E. bolsonensis, to which the common name Highland Gerbil Mouse would apply...
          
          , Eligmodontia (typus) bolsonensis
      • Genus Euneomys
        Euneomys
        Euneomys is a genus of rodent in the family Cricetidae.It contains the following species:* Patagonian Chincilla Mouse * Burrowing Chincilla Mouse * Biting Chincilla Mouse...
        
        - Chinchilla Mice
        • Patagonian Chincilla Mouse
          Patagonian Chincilla Mouse
          The Patagonian Chincilla Mouse is a species of rodent in the family Cricetidae. It is found in Tierra del Fuego and neighboring areas of southernmost Argentina and Chile....
          
          , Euneomys chinchilloides
        • Burrowing Chincilla Mouse, Euneomys fossor
        • Biting Chincilla Mouse
          Biting Chincilla Mouse
          The Biting Chincilla Mouse is a species of rodent in the family Cricetidae. It is found in west central Argentina and nearby areas of Chile, where it inhabits highland meadows, probably at at elevations of 1740 to 3000 m....
          
          , Euneomys mordax
        • Peterson's Chincilla Mouse
          Peterson's Chincilla Mouse
          Peterson's Chincilla Mouse is a species of rodent in the family Cricetidae. It is found in west central and southern Argentina and nearby areas of Chile. The species is named after American paleontologist Olaf A. Peterson ....
          
          , Euneomys petersoni
      • Genus Galenomys - Garlepp's Mouse
        • Garlepp's Mouse
          Garlepp's Mouse
          Garlepp's Mouse is a species of rodent in the family Cricetidae. It is the only species in the genus Galenomys. It is found in western Bolivia, southern Peru and possibly Chile at elevations over 3,000 m in the Altiplano.-References:*Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea...
          
          , Galenomys garleppi
      • Genus Graomys
        Graomys
        Graomys is a genus of rodent in the family Cricetidae.It contains the following species:* Central Leaf-eared Mouse * Pale Leaf-eared Mouse * Edith's Leaf-eared Mouse...
        
        - Leaf-eared Mice
        • Central Leaf-eared Mouse
          Central leaf-eared mouse
          The central leaf-eared mouse is a species of rodent in the family Cricetidae. It is known only from central Argentina. Prior to 1994, it was considered a subspecies of G. griseoflavus....
          
          , Graomys centralis
        • Pale Leaf-eared Mouse
          Pale Leaf-Eared Mouse
          The Pale Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Bolivia.-References:* Baillie, J. 1996. . Downloaded on 19 July 2007....
          
          , Graomys domorum
        • Edith's Leaf-eared Mouse
          Edith's Leaf-Eared Mouse
          Edith's Leaf-eared Mouse is a species of rodentin the family Cricetidae.It is known only from Argentina, where it was found in a montane grassland on Otro Cerro at an elevation of 3000 m.-References:...
          
          , Graomys edithae
        • Gray Leaf-eared Mouse
          Gray Leaf-eared Mouse
          The Gray Leaf-eared Mouse, Graomys griseoflavus, is a rodent species from South America. It is found in Argentina, Bolivia, Brazil and Paraguay; its habitat includes the Gran Chaco.-References:*...
          
          , Graomys griseoflavus
      • Genus Ichthyurodon †
        • Ichthyurodon ameghinoi †
      • Genus Irenomys - Chilean Climbing Mouse
        • Chilean Climbing Mouse
          Chilean Climbing Mouse
          Irenomys tarsalis, also known as the Chilean Climbing Mouse, Chilean Tree Mouse, or Long-footed Irenomys, is a rodent found in Chile, from about 36° to 46°S, and in adjacent Argentina, mainly in forests...
          
          , Irenomys tarsalis
      • Genus Loxodontomys
        Loxodontomys
        Loxodontomys is a genus of South American rodents in the tribe Phyllotini of family Cricetidae. Two species are known, found in Argentina and Chile. They are as follows:* Southern Big-eared Mouse...
        
        
        • Southern Big-eared Mouse
          Southern Big-eared Mouse
          The southern big-eared mouse , also known as the southern pericote, is a species of rodent in the family Cricetidae. It is found in Argentina and Chile, and is one of only two species in its genus...
          
          , Loxodontomys micropus
        • Pikumche pericote
          Pikumche pericote
          The Pikumche pericote is a species of rodent in the family Cricetidae. It is known only from central Chile, where its range includes xeric shrublands .-References:...
          
          , Loxodontomys pikumche
      • Genus Neotomys - Andean Swamp Rat
        • Andean Swamp Rat
          Andean Swamp Rat
          The Andean Swamp Rat is a species of rodent in the family Cricetidae. It is the only species in the genus Neotomys.It is found in Argentina, Bolivia, Chile, and Peru.-References:...
          
          , Neotomys ebriosus
      • Genus Olympicomys †
        • Olympicomys vossi †
      • Genus Phyllotis
        Phyllotis
        Phyllotis is a genus of rodent in the family Cricetidae.It contains the following species:* Phyllotis alisosiensis* Friendly Leaf-eared Mouse * Andean Leaf-eared Mouse...
        
        - Leaf-Eared Mice
        • Friendly Leaf-eared Mouse
          Friendly Leaf-eared Mouse
          The Friendly Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found only in Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis amicus
        • Andean Leaf-eared Mouse
          Andean Leaf-eared Mouse
          The Andean Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found in Ecuador and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis andium
        • Anita's Leaf-eared Mouse
          Anita's leaf-eared mouse
          Anita's leaf-eared mouse is a species of rodent in the family Cricetidae. It was discovered in Tucumán Province in northwestern Argentina in alder forest of the upper part of the Southern Andean Yungas ecoregion, on the eastern slopes of the Andes. The species is terrestrial and nocturnal, and was...
          
          , Phyllotis anitae
        • Buenos Aires Leaf-eared Mouse
          Buenos Aires Leaf-eared Mouse
          The Buenos Aires Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found only in Argentina.-References:* Contreras, L. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis bonariensis
        • Capricorn Leaf-eared Mouse
          Capricorn Leaf-eared Mouse
          The Capricorn Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found in Argentina and Bolivia.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis caprinus
        • Darwin's Leaf-eared Mouse
          Darwin's Leaf-eared Mouse
          Darwin's Leaf-eared Mouse is a species of rodent in the family Cricetidae. It has terrestrial habits and is endemic to coastal central Chile....
          
          , Phyllotis darwini
        • Definitive Leaf-eared Mouse
          Definitive Leaf-eared Mouse
          The Definitive Leaf-eared Mouse is a species of rodent in the family Cricetidae. It is found only in west central Peru, in rocky and shrub-covered areas at elevations between 2600 and 3000 m.-References:...
          
          , Phyllotis definitus
        • Haggard's Leaf-eared Mouse
          Haggard's Leaf-eared Mouse
          Haggard's Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found only in Ecuador.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis haggardi
        • Lima Leaf-eared Mouse
          Lima leaf-eared mouse
          The Lima leaf-eared mouse is a species of rodent in the family Cricetidae. It is found in a variety of habitats on the western slopes of the Andes from northern Chile to west-central Peru at elevations from sea level to 4000 m....
          
          , Phyllotis limatus
        • Master Leaf-eared Mouse
          Master Leaf-eared Mouse
          The Master Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found in Chile and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis magister
        • Osgood's Leaf-eared Mouse
          Osgood's Leaf-eared Mouse
          Osgood's Leaf-eared Mouse is a species of rodent in the family Cricetidae. It is found only in the Altiplano of northeastern Chile. The species is named after American zoologist Wilfred Hudson Osgood.-References:...
          
          , Phyllotis osgoodi
        • Bunchgrass Leaf-eared Mouse
          Bunchgrass Leaf-eared Mouse
          The Bunchgrass Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found in Argentina, Bolivia, and Peru.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis osilae
        • Wolffsohn's Leaf-eared Mouse
          Wolffsohn's Leaf-eared Mouse
          Wolffsohn's Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is found only in Bolivia.-References:* Baillie, J. 1996. . Downloaded on 9 July 2007....
          
          , Phyllotis wolffsohni
        • Yellow-rumped Leaf-eared Mouse
          Yellow-rumped Leaf-eared Mouse
          The Yellow-rumped Leaf-eared Mouse is a species of rodent in the family Cricetidae.It is the most widespread member of the genus, being found in or near the Andes of Argentina, Chile, Bolivia, and Peru, from sea level to 5,000 m.-References:* Baillie, J. 1996. . Downloaded on 9 July...
          
          , Phyllotis xanthopygus
      • Genus Punomys
        Punomys
        Punomys is a genus of rodent in the family Cricetidae.It contains the following species:* Eastern Puna Mouse * Puna Mouse...
        
        - Puna Mouse
        • Eastern Puna Mouse
          Eastern puna mouse
          The eastern puna mouse is a species of rodent in the family Cricetidae. It is endemic to southern Peru, where it is found in moist areas within puna grassland at elevations of 4500 to 4800 m in the Cordillera Carabaya section of the Cordillera Oriental.-References:*Musser, G. G. and M. D....
          
          , Punomys kofordi
        • Puna Mouse
          Puna Mouse
          The Puna Mouse is a species of rodent in the family Cricetidae. It is endemic to southern Peru, where it is found in puna habitat at elevations of 4400 to 4900 m in the Cordillera Occidental.-References:...
          
          , Punomys lemminus
      • Genus Reithrodon
        Reithrodon
        Reithrodon is a genus of rodent in the family Cricetidae.It contains the following species:* Bunny Rat * Naked-soled Conyrat...
        
        - Bunny Rat
        • Bunny Rat
          Bunny Rat
          The Bunny Rat is a species of rodent in the family Cricetidae. It is found in Argentina, Chile, and Uruguay....
          
          , Reithrodon auritus
        • Naked-soled Conyrat
          Naked-soled conyrat
          The naked-soled conyrat is a species of rodent in the family Cricetidae. It is found in grasslands in northern Argentina, southern Brazil, and Uruguay....
          
          , Reithrodon typicus
      • Genus Salinomys
        • Salt Flat Mouse
          Salt flat mouse
          The salt flat mouse is a sigmodontine rodent species in the family Cricetidae from South America. It is the only species in the genus Salinomys. Its habitat is scrublands bordering salt flats in central western Argentina at elevations around 400 m...
          
          , Salinomys delicatus
      • Genus Tafimys †
        • Tafimys powelli
      • Genus Tapecomys - Primordial Tapecua
        • Primordial Tapecua
          Primordial Tapecua
          The Primordial Tapecua is a species of medium sized rodent in the family Cricetidae. The type locality is in southeastern Bolivia. It is the only known species of the genus Tapecomys. Two specimens were found in 1991 in a forested region at an elevation of 1500 m near the village of Tapecua in the...
          
          , Tapecomys primus
  • Incertae sedis
    • Genus Juliomys
      Juliomys
      Juliomys is a genus of South American rodents of the family Cricetidae. Four species are known, all found in Argentina and Brazil. They are as follows:* Juliomys anoblepas * Juliomys ossitenuis*Juliomys pictipes...
      
      
      • Juliomys ossitenuis
      • Juliomys pictipes
      • Juliomys rimofrons
    • Genus Megaoryzomys †
      • Galápagos Giant Rat
        Galápagos Giant Rat
        Megaoryzomys curioi, also known as the Galápagos Giant Rat, is an extinct species of sigmodontine rodent, known only from Santa Cruz Island in the Galápagos Islands. It likely met its demise when European settlers introduced invasive species to the island. It is the only species in the genus...
        
        , Megaoryzomys curioi †