Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848
           Genus Acteon Montfort, 1810
           Genus Adalaria Bergh, 1878
           Genus Aplysia Linnaeus, 1767 - seahare
           Genus †Bactroptyxis Cossmann, 1896
           Genus Berthelinia Crosse, 1875
           Genus Bulla Linnaeus, 1758
           Genus Cavolinia Abildgaard, 1791
           Genus Diacria Gray, 1840
           Genus Umbraculum Schumacher, 1817