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 Discidae Thiele, 1931 (1866)
                 1 Genus Discus Fitzinger, 1833
                 2 Genus Anguispira Morse, 1864
                 3 Genus Zonodiscus Pilsbry, 1948, nom. illeg.