Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Cephalaspidomorpha see Class Cephalaspidomorphi Moy-Thomas & Mile, 1971 Order Petromyzontiformes Berg, 1940 - lampreys Family Petromyzontidae Bonaparte, 1832 - lampreys Genus Petromyzon Linnaeus, 1758 Petromyzon marinus Linnaeus, 1758 - eel sucker