Order of the subclass Cirripedia, and class subphylum Crustacea, containing crabs, shrimps, hermit crabs, crayfish, and lobsters. See also Crustacea. The first three pairs of the eight pairs of thoracic appendages evolved to maxillipeds, leaving in total ten appendages to function as legs, hence "decapoda" (ten-legs).

Alternative forms for decapod : decapoda, decapods.