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.
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.
Ceinidae is a family of amphipods. Until 1972, they were considered part of the family Phliantidae. Some genera previously included in this family have been transferred to the family Hyalidae.
Paracalliopiidae is a family of amphipods, containing the following genera:
Paracalliope is a genus of amphipod crustaceans that live in Australasia. They include the most common freshwater amphipods in New Zealand, where they are particularly frequent in slow-flowing reaches of rivers. They shelter among weed beds and are important prey items for fish such as the New Zealand smelt, Retropinna retropinna, which are in turn important prey for the freshwater eels Anguilla australis and Anguilla dieffenbachii. Paracalliope acts as an intermediate host for the nematode Hedruris spinigera, which can thus reach their primary host, the eel.
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.
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.
Iphimedia is a genus of amphipods which belongs to the family Iphimediidae in the arthropod group Amphipoda. It is the only genus of the family to have species which live in tropical waters. All other genera of the family are only found in cold or deep oceans.
Pontogeneiidae is a family of amphipod crustaceans, containing the following genera:
Nototropis is a genus of amphipod crustaceans, in the family, Atylidae, and was first described by Achille Costa in 1853.
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).
Talitrida is an infraorder of amphipods in the subclass Senticaudata.
Kamakidae is a family of amphipods belonging to the order Amphipoda.
Urothoides kurrawa is a species of amphipod crustacean, in the family Urothoidae. The species was first described in 1979 by Barnard & Drummond. The holotype was collected at Crib Point on Westernport Bay.
Maeridae is a family of marine amphipods, which was first described by Taudl Krapp-Schickel in 2008.
Parawaldeckia is a genus of amphipod crustacean in the family, Lysianassidae. and was first described by Thomas Roscoe Rede Stebbing in 1910. The type species is Parawaldeckia thomsoni.
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.
Ceradocus sellickensis is a species of amphipod in the subgenus, Denticeradocus, and the family, Maeridae, and was first described in 1939 by Keith Sheard. The holotype was collected at Sellicks Beach, in Gulf St Vincent. The species is endemic to Australia, and found only in South Australia.
Elasmopus is a cosmopolitan genus of amphipods in the family, Maeridae, and was first described in 1853 by Achille Costa. The type species is Elasmopus rapaxCosta, 1853.
