Amphipoda

order of malacostracan crustaceans Amphipoda (Amphipoda) is an order comprising closely related families of organisms. It contains 15 families with 34 known species. Key family groups include Aoridae, Bathyporeiidae, Brevitalitridae, Calliopiidae, Caprellidae, and Cheluridae. It belongs to Crustaceans (Malacostraca).