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
         (Achatinid Sigmurethra)
           Suborder Sigmurethra Pilsbry, 1900 see Group Sigmurethra Pilsbry, 1900
             Superfamily Punctoidea Morse, 1864
               Family Charopidae Hutton, 1884
                 Subfamily Charopinae Hutton, 1884
                   Genus Trachycystis Pilsbry, 1893
                     1 Subgenus Chalcocystis Watson, 1934
                     2 Subgenus Chilocystis Watson, 1934
                     3 Subgenus Cyclocystis Watson, 1934
                     4 Subgenus Lyrocystis Watson, 1934
                     5 Subgenus Liparocystis Watson, 1934
                     6 Subgenus Phaulocystis Watson, 1934
                     7 Subgenus Xerocystis Watson, 1934