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 Prosobranchia Milne-Edwards, 1848 - prosobranchs see Class Gastropoda Cuvier, 1795
               Order Archaeogastropoda Thiele, 1925 see Order Vetigastropoda Salvini-Plawen, 1980
                 Superfamily Trochacea see Superfamily Trochoidea Rafinesque, 1815
                   Family Seguenziidae Verrill, 1884
                     1 Genus Seguenzia Jeffreys, 1876
                     2 Genus Basilissa Watson, 1879
                     3 Genus Ancistrobasis Dall, 1889
                     4 Genus Basilissopsis Dautzenberg & Fischer, 1897
                     5 Genus Thelyssa Bayer, 1971
                     6 Genus Guttula Schepman, 1908
                     7 Genus Fluxina Dall, 1881