Amnicolidae is a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of small freshwater snail

Freshwater snail

A freshwater snail is one kind of freshwater mollusc, the other kind being freshwater clams and mussels, i.e. freshwater bivalves. Specifically a freshwater snail is a gastropod that lives in a watery non-marine habitat. The majority of freshwater gastropods have a shell, with very few exceptions....

s with a gill

Gill

A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water, afterward excreting carbon dioxide. The gills of some species such as hermit crabs have adapted to allow respiration on land provided they are kept moist...

 and an operculum

Operculum (gastropod)

The operculum, meaning little lid, is a corneous or calcareous anatomical structure which exists in many groups of sea snails and freshwater snails, and also in a few groups of land snails...

, aquatic

Aquatic animal

An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environments and the animals that...

 gastropod mollusks.

This family is in the superfamily Rissooidea

Rissooidea

Rissooidea, originally named Rissoacea by Grey, 1847, is a large taxonomic superfamily of small and minute saltwater, brackish water, freshwater, and semi-terrestrial snails which have gills and an operculum...

 and in the clade Littorinimorpha

Littorinimorpha

Littorinimorpha is a large clade of gastropods within Hypsogastropoda consisting primarily of marine species, but also aquatic and terrestrial species as well....

 (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

). Previously was considered as a subfamily of Hydrobiidae

Hydrobiidae

Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha.- Distribution :...

.

Subfamilies

The family Amnicolidae consists of 3 subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

):

• subfamily Amnicolinae Tryon, 1863 - synonym: Erhaiini Davis & Kuo, 1985
• subfamily Baicaliinae P. Fisher, 1885
• subfamily Emmericiinae Brusina, 1870

Genera

Genera in the family Amnicolidae include:

subfamily Amnicolinae

• Akiyoshia
  Akiyoshia
  Akiyoshia is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Amnicolidae.- Distribution :The distribution of Akiyoshia includes Japan from whence it was described....
  
  Kuroda & Habe, 1954
• Amnicola
  Amnicola
  Amnicola is a genus of very small freshwater snails which have an operculum. Amnicola species are aquatic prosobranch gastropod mollusks in the family Amnicolidae according to the taxonomy of the Gastropoda ....
  
  Gould & Haldeman, 1840 - type genus
  Type genus
  In biological classification, a type genus is a representative genus, as with regard to a biological family. The term and concept is used much more often and much more formally in zoology than it is in botany, and the definition is dependent on the nomenclatural Code that applies:* In zoological...
  
  
• Bythinella
  Bythinella
  Bythinella is a genus of very small freshwater snails, an aquatic gastropod mollusk in the family Amnicolidae ....
  
  Moquin-Tandon, 1856
• Marstoniopsis
  Marstoniopsis
  Marstoniopsis is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks or micromollusks in the family Amnicolidae.-Species:Species within the genus Marstoniopsis include:...
  
  van Regteren Altena, 1936
• Erhaia
  Erhaia
  Erhaia is a genus of small to minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Amnicolidae.Erhaia is the type genus of the tribe Erhaiini, which is now a synonym of the subfamily Amnicolinae....
  
  Davis & Kuo in Davis, Kuo, Hoagland, Chen, Yang & Chen, 1985

subfamily Baicaliinae

• Baicalia Martens, 1876 - type genus of the subfamily Baicaliinae
• Maackia Clessin, 1880

subfamily Emmericiinae Brusina, 1870

• Emmericia
  Emmericia
  Emmericia is a genus of very small freshwater snails which have an operculum, aquatic gastropod mollusks in the family Amnicolidae, according to the taxonomy of the Gastropoda ....
  
  Brusina, 1870 - type genus of the subfamily Emmericiinae