Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908 Phylum Chordata Bateson, 1885 - chordates Subphylum Craniata auct. Superclass Myxinomorphi [monotypic] see Infraphylum Myxinomorphi Class Myxini Jaekel, 1911 [monotypic] Order Myxiniformes - hagfishes Family Myxinidae Rafinesque, 1815 - hagfishes Subfamily Myxininae Rafinesque, 1815 - hagfishes Genus Notomyxine Nani & Gneri, 1951 [monotypic] Notomyxine tridentiger (Garman, 1899)