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 Trichiinae Ložek, 1956, nom. illeg. see Tribe Trochulini Lindholm, 1927
                 Genus Trichia Hartmann, 1840, nom. illeg.
                   1 Subgenus Dioscuria Lindholm, 1927
                   2 Subgenus Edentiella Poliński, 1929
                   3 Subgenus Petasina Beck, 1847