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
         (Helicid Sigmurethra)
           Superfamily Helixarionoidea Bourguignat, 1883, orth. inval.
             Family Ariophantidae Godwin-Austen, 1888
               Subfamily Dyakiinae Gude & Woodward, 1921 see Family Dyakiidae Gude & Woodward, 1921
                 Genus Staffordia Godwin-Austen, 1907