Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
     Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838
       1 Order †Cladoselachida Dean, 1909 see Order Cladoselachiformes
       2 Order †Symmoriida Zangerl, 1981 see Order Symmoriiformes Zangerl, 1981
       3 Order †Xenacanthida Glikman, 1964 see Order Xenacanthiformes Berg, 1955
       4 Order †Euselachii Hay, 1902 see Subclass Euselachii Hay, 1902
       5 Order Neoselachii Compagno, 1977 see Infraclass Elasmobranchii Bonaparte, 1838