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 †Protacrodontoidea Zangerl, 1981 [monotypic] see Order Protacrodontiformes
               Family †Tamiobatidae Hay, 1902 see Family Ctenacanthidae Bonaparte, 1850, "nom. praeval."