A decapod is a crustacean in the large order of Decapoda within the class Malacostraca, including crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers. The order is estimated to
Decapoda montage
"Decapoda" from Ernst Haeckel's Kunstformen der Natur, 1904
Crustaceans are mandibulate arthropods that are traditionally a part of the paraphyletic subphylum Crustacea. Crustaceans are mainly aquatic, including decapods, seed shrimps, branchiopods, fish lice,
Decapod
…A decapod is a crustacean in the large order of Decapoda (from Ancient Greek δέκά déka 'ten' + πούς poús 'foot') within the class Malacostraca, including crabs, lobsters, crayfish…