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
                 1 Genus Myxine Linnaeus, 1758
                 2 Genus Notomyxine Nani & Gneri, 1951 [monotypic]
                 3 Genus Neomyxine Richardson, 1953 [monotypic]
                 4 Genus Nemamyxine Richardson, 1958