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 Amphidoxinae Thiele, 1931 see Subfamily Charopinae Hutton, 1884
                   Genus Therasia Hutton, 1883
                     1 Subgenus Phenacohelix Suter, 1892 see Genus Phenacohelix Suter, 1892
                     2 Subgenus Serpho Hutton, 1904
                     3 Subgenus Thalassohelix Pilsbry, 1892
                     4 Subgenus Thermia Hutton, 1904