Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
         Superorder Euselachii Hay, 1902 see Subclass Euselachii Hay, 1902
           Order †Ctenacanthiformes Glikman, 1964
             Superfamily †Hybodontoidea Owen, 1846 see Order Hybodontiformes Patterson, 1966
               Family †Hybodontidae Agassiz, 1843