Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Gastropoda Cuvier, 1795 - snails and slugs
     Subclass Divasibranchia Minichev & Starobogatov, 1975
       Order Stylommatophora Schmidt, 1855 see Infraorder Stylommatophora Schmidt, 1855
         (Helicid Sigmurethra)
           Superfamily Polygyroidea Pilsbry, 1895 see Superfamily Helicoidea Rafinesque, 1815
             Family Polygyridae Pilsbry, 1895
               Subfamily Polygyrinae Pilsbry, 1895
                 1 Genus Polygyra Say, 1818
                 2 Genus Daedalochila Beck, 1837
                 3 Genus Erectidens Pilsbry, 1953
                 4 Genus Giffordius Pilsbry, 1930
                 5 Genus Mesodon Férussac, 1821
                 6 Genus Polygyriscus Pilsbry, 1948
                 7 Genus Praticolella Martens, 1892
                 8 Genus Stenotrema Rafinesque, 1819
                 9 Genus Trilobopsis Pilsbry, 1939