[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 †Xenacanthimorpha
             Order †Xenacanthiformes Berg, 1955
               Family †Diplodoselachidae Dick, 1981
                 1 Genus †Orthacanthus Agassiz, 1843
                 2 Genus †Diplodoselache Dick, 1981
                 3 Genus †Lebachacanthus Soler-Gijón, 1997