Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Divasibranchia Minichev & Starobogatov, 1975
       Order Basommatophora Keferstein, 1865 see Suborder Basommatophora Keferstein, in Bronn, 1864
         Superfamily Planorbioidea Vaught, 1989, orth. inval. see Superfamily Planorboidea Rafinesque, 1815
           Family Planorbidae Rafinesque, 1815 - planorbids
             Subfamily Helisomatinae Baker, 1928 see Tribe Coretini Gray, 1847
               Genus Planorbella Haldeman, 1843
                 1 Subgenus Pierosoma Dall, 1905
                 2 Subgenus Seminolina Pilsbry, 1934