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
               1 Genus Trigonochlamys Boettger, 1881
               2 Genus Drilolestes Lindholm, 1925
               3 Genus Hyrcanolestes Simroth, 1901
               4 Genus Parmacellilla Simroth, 1910
               5 Genus Pseudomilax Boettger, 1881
               6 Genus Selenochlamys Boettger, 1883