arthropod - invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin

class Crustacea, Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas

green gland - one of a pair of glands (believed to have excretory functions) in some crustaceans near the base of the large antennae

malacostracan crustacean - a major subclass of crustaceans

decapod, decapod crustacean - crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax

brachyuran - typical crabs

stomatopod, stomatopod crustacean - a kind of crustacean

branchiopod, branchiopod crustacean, branchiopodan - aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding

copepod, copepod crustacean - minute marine or fresh-water crustaceans usually having six pairs of limbs on the thorax; some abundant in plankton and others parasitic on fish

mussel shrimp, ostracod, seed shrimp - tiny marine and freshwater crustaceans with a shrimp-like body enclosed in a bivalve shell

barnacle, cerriped, cerripede - marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces

chela, nipper, pincer, claw - a structure like a pincer on the limb of a crustacean or other arthropods