Order: Myxiniformes (Hagfishes)
Family: Myxinidae (Hagfishes)
| Genus/Species | Common Name | Image |
| Eptatretus aceroi | Unspecified |  |
| Eptatretus alastairi | Unspecified |  |
| Eptatretus ancon | Unspecified |  |
| Eptatretus astrolabium | Unspecified |  |
| Eptatretus atami | Brown hagfish |  |
| Eptatretus bischoffii | Unspecified |  |
| Eptatretus bobwisneri | Unspecified |  |
| Eptatretus burgeri | Inshore hagfish |  |
| Eptatretus caribbeaus | Unspecified |  |
| Eptatretus carlhubbsi | Giant hagfish |  |
| Eptatretus cheni | Unspecified |  |
| Eptatretus chinensis | Unspecified |  |
| Eptatretus cirrhatus | Broad-gilled hagfish |  |
| Eptatretus cryptus | Cryptic hagfish |  |
| Eptatretus deani | Black hagfish |  |
| Eptatretus fernholmi | Unspecified |  |
| Eptatretus fritzi | Guadalupe hagfish | |
| Eptatretus goliath | Goliath hagfish |  |
| Eptatretus gomoni | Gomon's hagfish |  |
| Eptatretus grouseri | Unspecified |  |
| Eptatretus hexatrema | Six-gill hagfish |  |
| Eptatretus indrambaryai | Unspecified | |
| Eptatretus laurahubbsae | Unspecified | |
| Eptatretus longipinnis | Long-finned hagfish |  |
| Eptatretus luzonicus | Unspecified |  |
| Eptatretus mcconnaugheyi | Short-head hagfish |  |
| Eptatretus mccoskeri | McCosker's hagfish |  |
| Eptatretus mendozai | Mendoza's hagfish |  |
| Eptatretus menezesi | Unspecified |  |
| Eptatretus minor | Unspecified |  |
| Eptatretus moki | Mok's hagfish | |
| Eptatretus multidens | Unspecified |  |
| Eptatretus nanii | Unspecified | |
| Eptatretus nelsoni | Unspecified |  |
| Eptatretus octatrema | Eight-gill hagfish |  |
| Eptatretus okinoseanus | Unspecified |  |
| Eptatretus poicilus | Mottled hagfish |  |
| Eptatretus polytrema | Fourteen-gill hagfish |  |
| Eptatretus profundus | Five-gill hagfish | |
| Eptatretus sheni | Unspecified |  |
| Eptatretus sinus | Cortez hagfish | |
| Eptatretus springeri | Gulf hagfish |  |
| Eptatretus stoutii | Pacific hagfish |  |
| Eptatretus strahani | Strahan's hagfish |  |
| Eptatretus strickrotti | Strickrott's hagfish |  |
| Eptatretus taiwanae | Unspecified |  |
| Eptatretus walkeri | Walker's hagfish |  |
| Eptatretus wayuu | Unspecified |  |
| Eptatretus wisneri | Unspecified |  |
| Eptatretus yangi | Unspecified |  |
| Myxine affinis | Patagonian hagfish |  |
| Myxine australis | Unspecified |  |
| Myxine capensis | Cape hagfish |  |
| Myxine circifrons | White-face hagfish |  |
| Myxine debueni | Unspecified | |
| Myxine dorsum | Unspecified | |
| Myxine fernholmi | Unspecified |  |
| Myxine formosana | Unspecified |  |
| Myxine garmani | Unspecified |  |
| Myxine glutinosa | Atlantic hagfish |  |
| Myxine hubbsi | Unspecified |  |
| Myxine hubbsoides | Unspecified | |
| Myxine ios | White-headed hagfish |  |
| Myxine jespersenae | Jespersen's hagfish |  |
| Myxine knappi | Unspecified |  |
| Myxine kuoi | Unspecified |  |
| Myxine limosa | Unspecified |  |
| Myxine mccoskeri | Unspecified |  |
| Myxine mcmillanae | Unspecified |  |
| Myxine paucidens | Unspecified |  |
| Myxine pequenoi | Unspecified |  |
| Myxine robinsorum | Unspecified | |
| Myxine sotoi | Unspecified |  |
| Nemamyxine elongata | Slender hagfish |  |
| Nemamyxine kreffti | Unspecified |  |
| Neomyxine biniplicata | Unspecified |  |
| Neomyxine caesiovitta | Unspecified |  |
| Notomyxine tridentiger | Unspecified |  |
| Rubicundus eos | Unspecified |  |
| Rubicundus lakeside | Unspecified |  |
| Rubicundus lopheliae | Unspecified |  |
| Rubicundus rubicundus | Unspecified | |