[Phylum] Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Superorder †Xenacanthimorpha 1 Order †Bransonelliformes Hampe & Ivanov, 2007 2 Order †Xenacanthiformes Berg, 1955