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 Rhytidoidea Pilsbry, 1893
               1 Family Rhytididae Pilsbry, 1893
               2 Family Systrophiidae Thiele, 1926 see Subfamily Scolodontinae Baker, 1925
               3 Family Chlamydephoridae Cockerell, 1935 (1903) [monotypic]
               4 Family Haplotrematidae Baker, 1925