Superphylum Deuterostomia Grobben, 1908 - deuterostomes
see Infrakingdom Deuterostomia Grobben, 1908
Phylum Chordata Bateson, 1885 - chordates
Subphylum Craniata auct.
see Subphylum Vertebrata Cuvier, 1812
Vertebrata (Lamarck, 1801) - vertebrates
see Subphylum Vertebrata Cuvier, 1812
Superclass Petromyzontomorphi [monotypic]
Class Petromyzontida [monotypic] - lampreys
Order Petromyzontiformes Berg, 1940 - lampreys
Family Petromyzontidae Bonaparte, 1832, sedis mutabilis - lampreys
Subfamily Lampetrinae
Genus Lethenteron Creaser & Hubbs, 1922