Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Holocephali Bonaparte, 1832 Order Chimaeriformes Obruchev, 1953 - chimaeras 2 Suborder †Echinochimaeroidei [monotypic] 3 Suborder Chimaeroidei Patterson, 1965