[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class †Placodermi McCoy, 1848
           Order †Macropetalichthyiformes
             Family †Macropetalichthyidae Eastman, 1898
               1 Genus †Acanthaspis Newberry, 1875, nom. illeg. see Genus Ohiodorulites Whitley, 1933
               2 Genus †Macropetalichthys Norwood & Owen, 1846
               3 Genus †Polyaspis Heintz, 1932, nom. nud.
               4 Genus †Lunaspis Broili, 1929
               5 Genus †Heintzaspis Strand, 1932