Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct.
       Infraphylum Vertebrata Lamarck, 1801 - vertebrates
         Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
           Eugnathostomata
             Grade Chondrichthyomorphi [monotypic]
               Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
                 Superorder †Ctenacanthimorpha
                   Order †Ctenacanthiformes Glikman, 1964
                     1 Genus †Carinacanthus Bryant, 1934, incertae sedis
                     2 Family †Ctenacanthidae Bonaparte, 1850, "nom. praeval."