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

genus Daphnia - water fleas

Anostraca, order Anostraca - small aquatic crustaceans lacking a carapace: fairy shrimps; brine shrimps

Notostraca, order Notostraca - small freshwater crustaceans with a shield-shaped carapace

genus Triops, Triops - type genus of the family Triopidae: small crustaceans with a small third median eye

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