Fishes
   Class Myxini (Jaekel, 1911) see Subclass Myxinoidea
     Order Myxiniformes - hagfishes
       Family Myxinidae Rafinesque, 1815 - hagfishes
         Subfamily Eptatretinae
           01 Genus Bdellostoma Müller, 1835 see Genus Eptatretus Cloquet, 1819
           02 Genus Dodecatrema Fowler, 1947 see Genus Eptatretus Cloquet, 1819
           03 Genus Eptatretus Cloquet, 1819
           04 Genus Heptatrema Duméril, 1832, nom. van. see Genus Eptatretus Cloquet, 1819
           05 Genus Heptatremus Swainson, 1839, nom. null. see Genus Heptatrema Duméril, 1832, nom. van.
           06 Genus Heptatretus Regan, 1912, nom. van. see Genus Eptatretus Cloquet, 1819
           07 Genus Heterotrema Girard, 1855, nom. inval. see Genus Eptatretus Cloquet, 1819
           08 Genus Hexabranchus Schultze, 1836, nom. illeg. see Genus Eptatretus Cloquet, 1819
           09 Genus Hexatrema Girard, 1855, nom. inval. see Genus Eptatretus Cloquet, 1819
           10 Genus Homea Fleming, 1822 see Genus Eptatretus Cloquet, 1819
           11 Genus Paramyxine Dean, 1904 see Genus Eptatretus Cloquet, 1819
           12 Genus Polistotrema Gill, 1881 see Genus Eptatretus Cloquet, 1819
           13 Genus Polytrema Girard, 1855 see Genus Eptatretus Cloquet, 1819