"[Pisces]"
   Class Myxini Jaekel, 1911
     Order Myxiniformes - hagfishes
       Family Myxinidae Rafinesque, 1815 - hagfishes
         1 Subfamily Myxininae Rafinesque, 1815 - hagfishes
         2 Subfamily Eptatretinae Bonaparte, 1850 - multi-gill hagfishes