Gammarida

thumb|Allocrangonyx pellucidus (Oklahoma Cave Amphipod) in a cave spring in the Arbuckle mountains of Oklahoma. Allocrangonyx is a genus of troglobitic amphipod crustaceans from the South Central United States. The two species are both listed as vulnerable on the IUCN Red List. The animals are blind and unpigmented. During the male's development, the outer ramus of the third uropod differentiates into secondary segments and grows to a length greater than the animal's body length.

Pseudoniphargus is a genus of crustacean in family Pseudoniphargidae. It contains the following species:

species of crustacean