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 Helicoidea Rafinesque, 1815
             Family Hygromiidae Tryon, 1866
               Subfamily Hygromiinae Tryon, 1866
                 Genus Archaica Schileyko, 1970
                   1 Subgenus Riedelia Schileyko, 1972
                   2 Subgenus Ugama Schileyko, 1978