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
               Family Ferussaciidae Bourguignat, 1883, nom. protect.
                 Genus Cecilioides Férussac, 1814
                   1 Subgenus Geostilbia Crosse, 1867
                   2 Subgenus Karolus de Folin, 1870
                   3 Subgenus Rhaphidiella Maltzan, 1886
                   4 Subgenus Terebrella Maltzan, 1886