[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Myxinomorphi [monotypic]
       Class Myxini Jaekel, 1911 [monotypic]
         Order Myxiniformes [monotypic] - hagfishes
           1 Family Myxinidae Rafinesque, 1815 - hagfishes