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| any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton | |||
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| class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas ❲Crustacea❳ |