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 Oleacinoidea H. Adams & A. Adams, 1855
               Family Spiraxidae Baker, 1939
                 Subfamily Spiraxinae Baker, 1939
                   Genus Spiraxis Adams, 1850
                     1 Subgenus Biangulaxis Pilsbry, 1907
                     2 Subgenus Dignaxis Baker, 1939
                     3 Subgenus Euspiraxis Pfeiffer, 1854
                     4 Subgenus Ravenia Crosse, 1873
                     5 Subgenus Repressaxis Baker, 1939