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 Trigonochlamydoidea Hesse, 1882 [monotypic] see Superfamily Parmacelloidea Fischer, 1856 (1855)
             Family Trigonochlamydidae Hesse, 1882
               Genus Trigonochlamys Boettger, 1881
                 Subgenus Phrixolestes Simroth, 1901