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|Noun||1.||Malacostraca - largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies|
class Crustacea, Crustacea - class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas
malacostracan crustacean - a major subclass of crustaceans
Euphausiacea, order Euphausiacea - small commonly luminescent crustaceans; important element of marine plankton: krill
Amphipoda, order Amphipoda - small flat-bodied semiterrestrial crustaceans: whale lice; sand-hoppers; skeleton shrimp
class - (biology) a taxonomic group containing one or more orders