Disparithelphusa pecki is a species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of freshwater crab

Freshwater crab

There are around 1,300 species of freshwater crabs, distributed throughout the tropics and subtropics, divided among eight families. They show direct development and maternal care of a small number of offspring, in contrast to marine crabs which release thousands of planktonic larvae. This limits...

 in the family Pseudothelphusidae

Pseudothelphusidae

Pseudothelphusidae is a family of freshwater crabs found chiefly in mountain streams in the Neotropics. They are believed to have originated in the Greater Antilles and then crossed to Central America via a Pliocene land bridge.-Parasitology:...

, and the only species in the genus Disparithelphusa.

The first specimens of D. pecki were collected by Stewart Peck in 1971 at an altitude of 600 metres (1,968.5 ft) in the Valle Nacional

Valle Nacional River

The Valle Nacional River is a river of Oaxaca state in Mexico.The river originates in the Sierra Juárez, Oaxaca.The ecology of the region, originally one of pine forests, is threatened by logging, agriculture and grazing....

, Oaxaca

Oaxaca

Oaxaca , , officially Estado Libre y Soberano de Oaxaca is one of the 31 states which, along with the Federal District, comprise the 32 federative entities of Mexico. It is divided into 571 municipalities; of which 418 are governed by the system of customs and traditions...

, Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 . They were deposited at the Museum of Natural History, Tulane University

Tulane University

Tulane University is a private, nonsectarian research university located in New Orleans, Louisiana, United States...

, and described as a new species by Alfred Smalley and Daniel Adkinson in 1984.

The species is listed as Data Deficient

Data Deficient

Data Deficient is a category applied by the IUCN, other agencies, and individuals to a species when the available information is not sufficient for a proper assessment of conservation status to be made...

 on the IUCN Red List

IUCN Red List

The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

.