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:
Hyalidae is a family of amphipods, containing 12 genera in two unequal subfamilies:
Haustoriidae is a family of amphipods. They are very distinctive stout-bodied burrowing animals.
Phliantidae is a family of isopod-like amphipod crustaceans chiefly from the southern hemisphere.
Talitridae is a family of amphipods. Terrestrial species are often referred to as landhoppers and beach dwellers are called sandhoppers or sand fleas. The name sand flea is misleading, though, because these talitrid amphipods are not siphonapterans, do not bite people, and are not limited to sandy beaches.
Lysianassidae is a family of marine amphipods, containing the following genera:
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‰.
Photis is a genus of amphipod crustaceans, containing the following species:
Amphilochidae is a family of amphipod crustaceans, containing the following genera:
Urothoe is a genus of very small marine amphipod crustaceans in the family Urothoidae. Members of the genus are found worldwide.
Monocorophium is a genus of amphipod crustaceans.
Pontogeneia is a genus of amphipods in the family Pontogeneiidae. It contains the following species:
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.
Talitrida is an infraorder of amphipods in the subclass Senticaudata.
Calliopius is a genus of amphipods in the family Calliopiidae. There are about nine described species in Calliopius.
Eupraxie Fedorovna Gurjanova was a Soviet hydrobiologist, carcinologist and zoogeographer, specialist in the systematics of isopod crustaceans and amphipods, doctor of biological sciences.
Odius is a genus of amphipods belonging to the family Ochlesidae.
Pleustidae is a family of amphipods belonging to the order Amphipoda.
Ceradocus is a genus of amphipods in the family, Maeridae, and was first described in 1853 by Achille Costa. The type species is Ceradocus orchestiipes.
