Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Holocephali Bonaparte, 1832 Order †Chondrenchelyiformes Moy-Thomas, 1939 [monotypic] 1 Family †Chondrenchelyidae Berg, 1940