anostraca(n = noun.animal) order anostraca - small aquatic crustaceans lacking a carapace: fairy shrimps; brine shrimps;
is a kind of animal order
is a member of branchiopoda, subclass branchiopoda
an order of small aquatic crustaceans lacking a carapace: fairy shrimps; brine shrimps. [WordNet 1.5]