Cambarellus patzcuarensis

Cambarellus patzcuarensis is a small, threatened species of crayfish in the family Cambaridae. It is native to Mexico and often kept in aquariums.
Description.
It measures in total length, including claws. Most specimens found in the wild are brown, sometimes with a gray or blue tint. "Cambarellus patzcuarensis" var. "Orange" (Mexican dwarf crayfish, sometimes Mexican dwarf orange crayfish) is an orange-coloured mutation often held in aquariums, but this form is rarely found in the wild.
Distribution.
The species is named after Lake Pátzcuaro, at an altitude of in Michoacán, Mexico. Besides in Lake Pátzcuaro, "C. patzcuarensis" also occurs in springs in Chapultepec, Opopeo and Tzurumutaro.
Conservation.
"C. patzcuarensis" is listed as an endangered species on the IUCN Red List.