Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908 Phylum Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Vertebrata Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Myopterygii Janvier, 1978 - myopterygians Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates Grade †Placodermiomorphi [monotypic] Class †Placodermi McCoy, 1848 Order †Ptyctodontiformes [monotypic] 1 Family †Ptyctodontidae Woodward, 1891