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 Pulmonata Cuvier, 1814 - land snails and slugs see Order Pulmonata Cuvier, 1814
               Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855
                 Suborder Sigmurethra Pilsbry, 1900 see Group Sigmurethra Pilsbry, 1900
                   Infraorder Holopoda
                     Superfamily Helicacea see Superfamily Helicoidea Rafinesque, 1815
                       Family Helicidae Rafinesque, 1815
                         1 Genus Theba Risso, 1826
                         2 Subfamily Helicigoninae Wenz, 1915 see Subfamily Ariantinae Mörch, 1864
                         3 Subfamily Helicodontinae Kobelt, 1904
                         4 Subfamily Leptaxinae Boettger, 1909 see Tribe Leptaxini Boettger, 1909
                         5 Subfamily Helicinae Rafinesque, 1815