Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Chondrichthiomorphi
               Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
                 Subclass Holocephali Bonaparte, 1832
                   Superorder Holocephalimorpha (Lund, 1986)
                     Cochliodontomorpha
                       1 Order †Squalorajiformes Patterson, 1965 [monotypic]
                       2.1.1 Order †Chondrenchelyiformes Moy-Thomas, 1939 [monotypic]
                       2.1.2 Order †Menaspiformes
                       2.2.1 Order †Cochliodontiformes Obruchev, 1953
                       2.2.2 Order Chimaeriformes Obruchev, 1953 - chimaeras