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
         (Achatinid Sigmurethra)
           Suborder Sigmurethra Pilsbry, 1900 see Group Sigmurethra Pilsbry, 1900
             Superfamily Punctoidea Morse, 1864
               Family Helicodiscidae Pilsbry, 1927
                 1 Genus Helicodiscus Morse, 1864
                 2 Genus Chanomphalus Strebel & Pfeffer, 1880
                 3 Genus Lilloiconcha Weyrauch, 1965
                 4 Genus Polygryiscus Vaught, 1989, orth. inval. see Genus Polygyriscus Pilsbry, 1948
                 5 Genus Radiodiscus Pilsbry, 1906
                 6 Genus Stenopylis Fulton, 1914
                 7 Genus Zilchogyra Weyrauch, 1965