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 Thecosomata Blainville, 1824 - shelled pteropods see Suborder Thecosomata Blainville, 1824
                 Suborder Euthecosomata Meisenheimer, 1905 see Infraorder Euthecosomata Meisenheimer, 1905
                   Family Cavoliniidae Gray, 1850 (1815)
                     Subfamily Clionae van der Spoel, 1967, orth. inval. see Subfamily Clioinae Jeffreys, 1869
                       Genus Clio Linnaeus, 1767