[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
           Superorder †Ctenacanthimorpha
             Order †Ctenacanthiformes Glikman, 1964
               Family †Ctenacanthidae Bonaparte, 1850, "nom. praeval."
                 1 Genus †Cladodus Agassiz, 1843
                 2 Genus †Ctenacanthus Agassiz, 1837
                 3 Genus †Tamiobatis Eastman, 1897