[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Kingdom Animalia Linnaeus, 1758 - animals
     Branch Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
       Division Bilateria Hatschek, 1888 see Subkingdom Bilateria Hatschek, 1888
         Subdivision Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
           Section Eucoelomata see Superphylum Eucoelomata
             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 Basommatophora Keferstein, 1865 see Suborder Basommatophora Keferstein, in Bronn, 1864
                     Genus Ferrissia Walker, 1903
                     Genus Helisoma Swainson, 1840
                     Genus Lymnaea Lamarck, 1799
                     Genus Physa Draparnaud, 1801