Fishes Class Myxini Jaekel, 1911 Order Myxiniformes - hagfishes Family Myxinidae Rafinesque, 1815 - hagfishes Subfamily Eptatretinae Bonaparte, 1850 - multi-gill hagfishes Genus Heptatrema Duméril, 1832, nom. van. see Genus Eptatretus Cloquet, 1819