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.
Dexaminidae is a family of amphipods. It contains the following genera:
Calliopiidae is a family of amphipods, containing the following genera:
Liljeborgiidae is a family of amphipods, containing the following genera:
Pardaliscidae is a family of oceanic amphipods whose members typically inhabit the deepest parts of the abyssal plains. It contains the following genera:
Anisogammaridae is a family of small benthic amphipods, endemic to the northern part of the Pacific rim. The family contains the following genera:
Oedicerotidae is a family of amphipods. It comprises the following genera:
Lysianassidae is a family of marine amphipods, containing the following genera:
Paracalliopiidae is a family of amphipods, containing the following genera:
Orchestia is a genus of amphipods in the family Talitridae. Species in Orchestia are parasitized by the Filozoan species Txikispora philomaios.
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‰.
Niphargus is by far the largest genus of its family, the Niphargidae, and the largest of all freshwater amphipod genera.
Niphargidae is a family of amphipod crustaceans. Its distribution is in western Eurasia, and its members mainly live in subterranean freshwaters habitats. It contains the following genera:
Amphilochidae is a family of amphipod crustaceans, containing the following genera:
Pontogeneiidae is a family of amphipod crustaceans, containing the following genera:
Stegocephalidae is a little-studied family of amphipods belonging to the suborder Gammaridea.
Bogidiellidae is a family of amphipod crustaceans, containing the following genera:
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.
Maeridae is a family of marine amphipods, which was first described by Taudl Krapp-Schickel in 2008.
