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 Tanaidacea Dana, 1849 - tanaids
             Suborder Apseudomorpha Sieg, 1980
               Superfamily Apseudoidea (Leach, 1814) Schram et al., 1986
                 01 Family Anuropodidae Bacescu, 1980 see Family Parapseudidae Gutu, 1981
                 02 Family Apseudellidae Gutu, 1972
                 03 Family Apseudidae Leach, 1814
                 04 Family Gigantapseudidae Kudinova-Pasternak, 1978
                 05 Family Kalliapseudidae Lang, 1956
                 06 Family Metapseudidae Lang, 1970
                 07 Family Pagurapseudidae Lang, 1970
                 08 Family Parapseudidae Gutu, 1981
                 09 Family Sphyrapidae Gutu, 1980 see Family Sphyrapodidae Gutu, 1980
                 10 Family Tanapseudidae Bacescu, 1978 see Subfamily Tanapseudinae Bacescu, 1978
                 11 Family Tanzanapseudidae Bacescu, 1975
                 12 Family Whiteleggiidae Gutu, 1972