Gammaridea is one of the suborders of the order Amphipoda, comprising small, shrimp-like crustaceans. Until recently, in a traditional classification, it encompassed about 7,275 (92%) of the 7,900 species of amphipods described by then, in approximately 1,000 genera, divided among around 125 families. That concept of Gammaridea included almost all freshwater amphipods, while most of the members still were marine.
Corophiidae is a family of amphipods, containing the following genera:
Calliopiidae is a family of amphipods, containing the following genera:
Pardaliscidae is a family of amphipods, whose members typically inhabit the deepest parts of ocean basins. It contains the following genera:
Lysianassidae is a family of marine amphipods, containing the following genera:
Leucothoe is a genus of amphipods in the family Leucothoidae. It contains the following species:
Gammaridae is a family of amphipods. In North America they are included among the folk taxonomic category of "scuds", and otherwise gammarids is usually used as a common name.
Gammarus is an amphipod crustacean genus in the family Gammaridae. It contains more than 200 described species, making it one of the most species-rich genera of crustaceans. Different species have different optimal conditions, particularly in terms of salinity, and different tolerances; Gammarus pulex, for instance, is a purely freshwater species, while Gammarus locusta is estuarine, only living where the salinity is greater than 25‰.
Idunella is a genus of crustacean in family Liljeborgiidae. It contains the following species:
Niphargus is by far the largest genus of its family, the Niphargidae, and the largest of all freshwater amphipod genera.
Pseudoniphargus is a genus of crustacean in family Pseudoniphargidae. It contains the following species:
Pontogeneiidae is a family of amphipod crustaceans, containing the following genera:
Photidae is a family of amphipod crustaceans, containing the following genera:
Abludomelita is a genus of amphipod crustacean.
Phoxocephalidae is a family of small, shrimp-like crustaceans in the suborder Gammaridea described by Georg Ossian Sars in 1891. It contains Cocoharpinia iliffei, a critically endangered species on the IUCN Red List.
Stenothoidae is a family of arthropods in the order Amphipoda.
Epimeria is a genus of amphipods in the family Epimeriidae. There are more than 80 described species in Epimeria.
Ampithoidae is a family of amphipod crustaceans. The family has a worldwide distribution as algal dwellers. They commonly create tube-shaped nests on their host plants or algae which serve as both shelter and food. Young ampithoids develop from eggs to a larval stage within their mother's brood-pouch, formed by the appendages of her abdomen.
Maeridae is a family of marine amphipods, which was first described by Taudl Krapp-Schickel in 2008.
