Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Superclass Myxinomorphi [monotypic]
         Class Myxini (Jaekel, 1911) [monotypic] see Subclass Myxinoidea
           Order Myxiniformes - hagfishes
             Family Myxinidae Rafinesque, 1815 - hagfishes
               Subfamily Myxininae
                 Genus Notomyxine Nani & Gneri, 1951 [monotypic]
                   Notomyxine tridentiger (Garman, 1899)