Phylum Chordata Bateson, 1885 - chordates
   Class †Conodonta Eichenberg, 1930
     Subclass †Conodonti Branson see Subclass Conodonta Eichenberg, 1930
       Order †Ozarkodinida Dzik
         Family †Polygnathidae Bassler
           Genus †Polygnathus Hinde, 1879
             †"Polygnathus semicostatus group"
               01 †Polygnathus latisemicostatus
               02 †Polygnathus paraobliquicostatus
               03 †Polygnathus semicostatus Branson & Mehl
               04 †Polygnathus triginus Kuzmin & Melnikova
               05 †Polygnathus fallax Helms & Wolska
               06 †Polygnathus lauriformis Dreesen & Dusar
               07 †Polygnathus pennatulus Ulrich & Bassler
               08 †Polygnathus timanicus Ovnatanova
               09 †Polygnathus brevilaminus Branson & Mehl
               10 †Polygnathus padovanii Perri & Spalletta