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 Neritacea see Superfamily Neritoidea Rafinesque, 1815
                   1 Family Neritopsidae Gray, 1847
                   2 Family Neritidae Rafinesque, 1815 - nerites
                   3 Family Phenacolepadidae Pilsbry, 1895
                   4 Family Titiscaniidae Bergh, 1890
                   5 Family Hydrocenidae Troschel, 1857
                   6 Family Helicinidae Férussac, 1822 - helicinids