Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
     Class Malacostraca Latreille, 1802
       Subclass Eumalacostraca Grobben, 1892
         Superorder Peracarida Calman, 1904
           Order Isopoda Latreille, 1817 - isopods
             Suborder Phreatoicidea Stebbing, 1893
               1 Family Amphisopodidae Nicholls, 1943
               2 Family Nichollsiidae Tiwari, 1955 see Family Hypsimetopodidae Nicholls, 1943
               3 Family Phreatoicidae Chilton, 1891