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
                 Genus Averellia Ancey, 1887
                   1 Subgenus Miraverellia Baker, 1922 see Genus Miraverellia Baker, 1922
                   2 Subgenus Discolepis Ancey, 1904
                   3 Subgenus Trichodiscina Martens, 1892 see Genus Trichodiscina Martens, 1892