| Noun | 1. | class Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleascrustacean - any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton Malacostraca, subclass Malacostraca - largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies class - (biology) a taxonomic group containing one or more orders | |