1. Crustacea definition: a collective term for members of the Crustacea class of (mainly aquatic ) mandibulate Meaning, pronunciation, translations and examples

2. Pl n a collective term for members of the Crustacea class of mandibulate arthropods, characterized by their usually chitinous exoskeletons Collins English

3. Branchiopoda - primitive aquatic mainly freshwater crustaceans: fairy shrimps; brine shrimps; tadpole shrimps; can shrimps; water fleas subclass Branchiopoda class Crustacea, Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas genus Daphnia - water fleas

4. Definition of Crustacean : any of a large class (Crustacea) of mostly aquatic mandibulate arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often much modified appendages on each segment, and two pairs of antennae and that include the lobsters, shrimp, crabs, wood lice, water fleas, and barnacles