Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Gnathostomata Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Holocephali Bonaparte, 1832 Order †Psammodontiformes Obruchev, 1953 [monotypic] Family †Psammodontidae de Koninck, 1878