Amphipoda is an order of malacostracan crustaceans with no carapace and generally with laterally compressed bodies. Amphipods range in size from 1 to 340 millimetres and are mostly detritivores or scavengers. There are more than 9,900 amphipod species so far described. They are mostly marine animals, but are found in almost all aquatic environments. Some 1,900 species live in fresh water, and the order also includes the terrestrial sandhoppers such as Talitrus saltator and Arcitalitrus sylvaticus.
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.
Corophiida is an infraorder of amphipods that contains the two parvorders Caprellidira and Corophiidira.
Eophliantidae is a family of amphipods, containing the following genera:
Lysianassidae is a family of marine amphipods, containing the following genera:
Talorchestia is a genus of amphipod of the family Talitridae, containing the following species:
Cyproideidae is a family of amphipod crustaceans. Eighteen genera and 43 species have been described as of 2009. They mostly occur mostly in the Southern Hemisphere, where they form associations with corals, sponges, crinoids and hydroids.
Photis is a genus of amphipod crustaceans, containing the following species:
Amphilochus is a genus of crustaceans in the Amphipoda order, containing the following species:
Urothoe is a genus of very small marine amphipod crustaceans in the family Urothoidae. Members of the genus are found worldwide.
Crassicorophium is a genus of amphipod crustaceans, comprising three species:
Apocorophium is a genus of amphipod crustaceans, comprising the following species:
Pontogeneiidae is a family of amphipod crustaceans, containing the following genera:
Atylidae is a family of amphipod crustaceans, containing the following genera:
Alicellidae is a family of amphipod crustaceans, which live as scavengers in the deep sea, often in association with hydrothermal vents. The family includes the following genera:
Platorchestia is a genus of sand flea, containing the following species:
Parhyale is a genus of amphipod crustaceans, containing the following species:
Martensia martensi is a species of amphipod crustacean, and the only species in the genus Martensia. It occurs in waters around Svalbard at depths of 37–95 metres (121–312 ft).
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.
