[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
               1 Family †Ctenacanthidae Bonaparte, 1850, "nom. praeval."
               2 Family †Heslerodidae Maisey, 2010