Phylum Chordata Bateson, 1885 - chordates Count: - Subphylum Vertebrata Cuvier, 1812 - vertebrates Count: - Class Cephalaspidomorpha see Class Cephalaspidomorphi Moy-Thomas & Mile, 1971 Count: [*] 1o1f3g3s Order Petromyzontiformes Berg, 1940 - lampreys Count: - Family Petromyzontidae Bonaparte, 1832 - lampreys Count: [*] 3g3s Genus Petromyzon Linnaeus, 1758 Count: - Petromyzon marinus Linnaeus, 1758 - eel sucker Count: -