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 Urocyclidae Simroth, 1889
               Subfamily Urocyclinae Simroth, 1889
                 Genus Trichotoxon Simroth, 1888
                   1 Subgenus Atrichotoxon Simroth, 1910
                   2 Subgenus Polytoxon Simroth, 1897
                   3 Subgenus Spirotoxon Simroth, 1897