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
                 Subclass Euselachii Hay, 1902 - sharks, rays, and related fossils
                   1 Genus †Acronemus Rieppel, 1982, incertae sedis
                   2 [stem] Order †Protacrodontiformes [monotypic]
                   3 Infraclass †Hybodonta [monotypic] - hybodonts
                   4 Infraclass Elasmobranchii Bonaparte, 1838