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 Trochidae Rafinesque, 1815 - top snails
                     Subfamily Gibbulinae Stoliczka, 1868 see Tribe Monodontini Gray, 1857, nom. illeg.
                       1 Genus Gibbula Risso, 1826
                       2 Genus Cittarium Philippi, 1847
                       3 Genus Gaza Watson, 1879