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 †Mayomyzontidae Bardack & Zangerl, 1971
?Genus †Hardistiella Janvier & Lund, 1983 [monotypic]
1 †Hardistiella montanensis Janvier & Lund, 1983