Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
     Class Branchiopoda Latreille, 1817 - branchiopods
     Class Branchiura Beddard, 1892 see Subclass Branchiura Thorell, 1864
     Class Cephalocarida H.L. Sanders, 1955 - cephalocarids
     Class Cirripedia (Rafinesque, 1816) see Infraclass Cirripedia Burmeister, 1834
     Class †Conchyliocarida Secretan, 1985 see Order Conchyliocarida Secretan, 1985
     Class Copepoda H. Milne-Edwards, 1840 see Subclass Copepoda H. Milne-Edwards, 1840
     Class †Euthycarcinoidea Gall & Grauvogel, 1964
     Class Malacostraca Latreille, 1802
     Class Mystacocarida Pennak & Zinn, 1943 see Subclass Mystacocarida Pennak & Zinn, 1943
     Class Ostracoda Latreille, 1802 - ostracods
     Class Remipedia Yager, 1981 - remipedes
     Class Tantulocarida Boxshall & Lincoln, 1983 see Subclass Tantulocarida Boxshall & Lincoln, 1983