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 Acavoidea Pilsbry, 1895
               1 Family Acavidae Pilsbry, 1895
               2 Family Caryodidae Connolly, 1915
               3 Family Macrocyclidae Thiele, 1926 [monotypic]
               4 Family Megomphicidae Baker, 1930