Arthropoda, phylum Arthropoda - jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes

crustacean - any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton

Malacostraca, subclass Malacostraca - largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies

order Stomatopoda, Stomatopoda - mantis shrimps

Entomostraca, subclass Entomostraca - in some older classifications includes the Branchiopoda and Copepoda and Ostracoda and Cirripedia; no longer in technical use

Branchiopoda, subclass Branchiopoda - primitive aquatic mainly freshwater crustaceans: fairy shrimps; brine shrimps; tadpole shrimps; can shrimps; water fleas

Copepoda, subclass Copepoda - minute planktonic or parasitic crustaceans

Ostracoda, subclass Ostracoda - seed shrimps

Cirripedia, subclass Cirripedia - barnacles

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