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 Achatinoidea Swainson, 1840
               1 Family Ferussaciidae Bourguignat, 1883, nom. protect.
               2 Family Subulinidae Fischer & Crosse, 1877
               3 Family Achatinidae Swainson, 1840
               4 Family Coeliaxidae Pilsbry, 1907 see Subfamily Coeliaxinae Pilsbry, 1907
               5 Family Thyrophorellidae Girard, 1895 [monotypic]