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:
Gammarellidae is a family of amphipods containing three genera:
Haustoriidae is a family of amphipods. They are very distinctive stout-bodied burrowing animals.
Pardaliscidae is a family of amphipods, whose members typically inhabit the deepest parts of ocean basins. It contains the following genera:
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.
Oedicerotidae is a family of amphipods. It comprises the following genera:
Lysianassidae is a family of marine amphipods, containing the following genera:
Eusiridae is a family of amphipods. It contains the following genera:
Allorchestes is a genus of amphipods with relatively small gnathopods, in the family Dogielinotidae; it contains the following species:
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‰.
Atylidae is a family of amphipod crustaceans, containing the following genera:
Platorchestia is a genus of sand flea, containing 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.
Eusirus is a genus of amphipods belonging to the family Eusiridae. The genus has cosmopolitan distribution. Within the genus Eusirus sexual dimorphism is weak, therefore identifying the sex of non-adult individuals is difficult.
Pleustidae is a family of amphipods belonging to the order Amphipoda.
Neoniphargidae is a family of crustaceans belonging to the order Amphipoda.
