Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801 Class Cephalaspidomorpha see Class Cephalaspidomorphi Kiaer & Stensiö, 1920 Order Petromyzontiformes Berg, 1940 - lampreys 1 Family Petromyzontidae Bonaparte, 1831 - lampreys