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 communis group"
               1 †Polygnathus communis Branson & Mehl
               2 †Polygnathus glaber Ulrich & Bassler
               3 †Polygnathus crowsnestpassensis D.I. Johnston & B.D.E. Chatterton, 2001