Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
       Order Nudibranchia Cuvier, 1814 - "true" nudibranchs
         Suborder Doridina Odhner, 1934
           Superfamily Gnathodoridoidea Schmekel & Portmann, 1982, nom. inval.
             Family Doridoxidae Bergh, 1899 [monotypic]
               Genus Doridoxa Bergh, 1899
                 1 Subgenus Doridoides Thiele, 1931, nom. illeg. see Genus Doridomorpha Eliot, 1903