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 Triodopsinae Pilsbry, 1940
                 1 Genus Triodopsis Rafinesque, 1819
                 2 Genus Allogona Pilsbry, 1939
                 3 Genus Neohelix Ihering, 1892
                 4 Genus Vespericola Pilsbry, 1939
                 5 Genus Webbhelix Emberton, 1988
                 6 Genus Xolotrema Rafinesque, 1819