living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         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 Clionidae Rafinesque, 1815
                   1 Genus Cione see Genus Clione Pallas, 1774
                   1 Genus Clione Pallas, 1774 - sea-butterfly
                   2 Genus Paraclione Tesch, 1903
                   3 Genus Paedoclione Danforth, 1907
                   4 Genus Fowlerina Pelseneer, 1906
                   5 Genus Thalassopterus Kwietniewski, 1910