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
             1 ?Genus †Myxinikela Bardack, 1991
             2 Family Myxinidae Rafinesque, 1815 - hagfishes