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 Helicoidea Rafinesque, 1815
             Family Helminthoglyptidae Pilsbry, 1939
               Subfamily Xanthonychinae Strebel & Pfeffer, 1879
                 1 Genus Xanthonyx Crosse & Fischer, 1867
                 2 Genus Averellia Ancey, 1887
                 3 Genus Bunnya Baker, 1942
                 4 Genus Cryptostracon Kobelt, 1880, nom. illeg. see Genus Cryptostrakon Binney, 1879
                 5 Genus Leptarionta Crosse & Fischer, 1872
                 6 Genus Metostracon Pilsbry, 1900