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 Cephalaspidea Fischer, 1883
         Superfamily Acteonoidea d'Orbigny, 1843
           Family Diaphanidae Odhner, 1914 (1857)
             1 Genus Diaphana Brown, 1827
             2 Genus Colpodaspis Sars, 1870
             3 Genus Colobocephalus Sars, 1870
             4 Genus Newnesia Smith, 1902
             5 Genus Rhinodiaphana Lemche, 1967
             6 Genus Toledonia Dall, 1902
             7 Genus Woodbridgea Berry, 1953