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 Helicidae Rafinesque, 1815
               Subfamily Geomitrinae Boettger, 1909
                 Genus Discula Lowe, 1852
                   1 Subgenus Callina Lowe, 1855
                   2 Subgenus Hystricella Lowe, 1855