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

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

Balanidae, family Balanidae - stalkless barnacles

family Lepadidae, Lepadidae - goose barnacles

class - (biology) a taxonomic group containing one or more orders