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 Mesogastropoda Thiele, 1925 - mesogastropods see [unranked] mesogastropods
                 Superfamily Littorinacea Gray, 1840 see Superfamily Littorinoidea Children, 1834
                   Family Pomatiasidae Gray, 1852 see Family Pomatiidae Newton, 1891 (1828)
                     Subfamily Pomatiasinae Gray, 1852 see Subfamily Pomatiinae Newton, 1891 (1828)
                       1 Genus Lithidion Gray, 1850
                       2 Genus Guillainia Crosse, 1885
                       3 Genus Georgia Bourguignat, 1882, nom. illeg.
                       4 Genus Tropidophora Troschel, 1847
                       5 Genus Pomatias Studer, 1789