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 Gymnosomata Blainville, 1824 - naked pteropods see Suborder Gymnosomata Blainville, 1824
         Family Thliptodontidae Kwietniewski, 1902 (1902) see Subfamily Thliptodontinae Kwietniewski, 1902 (1902)
           1 Genus Thliptodon Boas, 1886
           2 Genus Cephalobrachia Bonnevie, 1913