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 Helixarionoidea Bourguignat, 1883, orth. inval.
             Family Helixarionidae Bourguignat, 1883, orth. inval. see Family Helicarionidae Bourguignat, 1877
               Subfamily Microcystinae Thiele, 1931
                 Genus Microcystis Beck, 1837
                   1 Subgenus Allenoconcha Preston, 1913
                   2 Subgenus Diepenheimia Preston, 1913
                   3 Subgenus Greenwoodoconcha Preston, 1913
                   4 Subgenus Iredaleoconcha Preston, 1913
                   5 Subgenus Cnesticystis Baker, 1938
                   6 Subgenus Facorhina Baker, 1938
                   7 Subgenus Leurocystis Baker, 1938