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 Helminthoglyptinae Pilsbry, 1939
                 Genus Monadenia Pilsbry, 1895
                   1 Subgenus Corynadenia Berry, 1940
                   2 Subgenus Shastelix Roth, 1981