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
             1 †"Polygnathus communis group"
             2 †"Polygnathus germanus group"
             3 †"Polygnathus semicostatus group"