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.
Caprellidira is a parvorder of marine crustaceans of the infraorder Corophiida. The group includes skeleton shrimps (Caprellidae) and whale lice (Cyamidae).
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.
Bateidae is a family of amphipod crustaceans, comprising the single genus Batea, which in turn contains thirteen species:
Corophiida is an infraorder of amphipods that contains the two parvorders Caprellidira and Corophiidira.
Phliantidae is a family of isopod-like amphipod crustaceans chiefly from the southern hemisphere.
Anisogammaridae is a family of small benthic amphipods, endemic to the northern part of the Pacific rim. The family contains the following genera:
Lysianassidae is a family of marine amphipods, containing the following genera:
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.
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:
Amaryllididae is a family of marine benthic amphipods found throughout the southern hemisphere. These smooth, laterally compressed amphipods can be distinguished by the accessory setal row of the mandible having a distal tuft. It was first described in 2002 by James K. Lowry and Helen E. Stoddart. It contains the following genera:
Pallaseidae is a family of amphipod crustaceans endemic to Lake Baikal. Some species are also found in the Angara River which flows out of Lake Baikal, and one species is distributed throughout Northern Palearctic. The composition of the family is a subject of discussion, with different sources listing either 9 genera and 58 species, or 8 genera and 20 species. They are benthic, nectobenthic or epibiotic.
Amphilochus is a genus of crustaceans in the Amphipoda order, containing the following species:
Dikerogammarus is a genus of amphipod crustaceans, containing the following species:
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:
Caprella mendax is a species of skeleton shrimp in the genus Caprella.
Caprella kominatoensis is a species of skeleton shrimp in the genus Caprella. It was described in 1986 by Ichiro Takeuchi for specimens from Amatsu-Kominato, Chiba Prefecture, Japan, and is closely related to C. decipiens.
Caprella bathytatos is a species of skeleton shrimp in the genus Caprella. It was described in 1998 by Joel W. Martin and Gary Pettit, who discovered it living on the mouthparts of the crab Macroregonia macrochira near hydrothermal vents in British Columbia.
Caprelloidea is a superfamily of marine crustaceans in the order Amphipoda. It includes "untypical" forms of amphipods, such as the skeleton shrimps (Caprellidae) and whale lice (Cyamidae). The group was formerly treated as one of the four amphipod suborders, Caprellidea, but has been moved down to the superfamily rank by Myers & Lowry after phylogenetic studies of the group, and is now contained in the infraorder Corophiida of the suborder Senticaudata. The group includes the following families.
Brandtia is a monotypic genus of amphipod in the Acanthogammaridae family, containing the species Brandtia latissima. Like other members of the family, it is endemic to Lake Baikal. This omnivore is found at depths of 1–65 m (3–213 ft) among stones. It is up to 1.9 cm (0.75 in) long.
