Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908 Phylum Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Infraphylum Vertebrata Lamarck, 1801 - vertebrates Superclass Petromyzontomorphi [monotypic] Class Petromyzontida [monotypic] - lampreys see Class Petromyzonti Order Petromyzontiformes Berg, 1940 - lampreys Family †Mayomyzontidae Bardack & Zangerl, 1971