|Pacific hagfish resting on the ocean bottom, at 280 m depth off the Oregon coast.|
Hagfish, the class Myxini (also known as Hyperotreti), are eel-shaped slime-producing marine animals (occasionally called slime eels). They are the only known living animals that have a skull but not a vertebral column. Along with lampreys, hagfish are jawless and are living fossils; hagfish are basal to vertebrates, and living hagfish remain similar to hagfish 300 million years ago.
The classification of hagfish has been controversial. The issue is whether the hagfish is itself a degenerate type of vertebrate-fish (most closely related to lampreys), or else may represent a stage which precedes the evolution of the vertebral column (as do lancelets). The original scheme groups hagfish and lampreys together as cyclostomes (or historically, Agnatha), as the oldest surviving class of vertebrates alongside gnathostomes (the now-ubiquitous jawed-vertebrates). An alternative scheme proposed that jawed-vertebrates are more closely related to lampreys than to hagfish (i.e., that vertebrates include lampreys but exclude hagfish), and introduces the category craniata to group vertebrates near hagfish. Recent DNA evidence has supported the original scheme.
Physical characteristics 
Body features 
Hagfish average about 0.5 meters (19.7 in) in length. The largest known species is Eptatretus goliath with a specimen recorded at 127 cm (4 ft 2 in), while Myxine kuoi and Myxine pequenoi seem to reach no more than 18 cm (7.1 in) (some have been seen as small as 4 cm (1.6 in)).
Hagfish have elongated, eel-like bodies, and paddle-like tails. They have cartilaginous skulls (although the part surrounding the brain is composed primarily of a fibrous sheath) and tooth-like structures composed of keratin. Colors depend on the species, ranging from pink to blue-grey, and black or white spots may be present. Eyes are simple eyespots, not compound eyes that can resolve images. Hagfish have no true fins and have six or eight barbels around the mouth and a single nostril. Instead of vertically articulating jaws like Gnathostomata (vertebrates with jaws), they have a pair of horizontally moving structures with tooth-like projections for pulling off food. The mouth of the hagfish has two pairs of horny, comb-shaped teeth on a cartilaginous plate that protracts and retracts. These teeth are used to grasp food and draw it toward the pharynx.
Hagfish are long and vermiform, and can exude copious quantities of a milky and fibrous slime or mucus from some 100 glands or invaginations running along its flanks. The typical species Myxine glutinosa was named for this slime. When captured and held, e.g., by the tail, they secrete the microfibrous slime, which expands into up to 20 litres (5¼ gallons) of gelatinous and sticky goo when combined with water. If they remain captured, they can tie themselves in an overhand knot which works its way from the head to the tail of the animal, scraping off the slime as it goes and freeing them from their captor, as well as the slime. It has been conjectured that this singular behavior assists them in extricating themselves from the jaws of predatory fish or from the interior of their own "prey", and that the "sliming" might act as a distraction to predators.
Recently it has been reported that the slime entrains water in its microfilaments, creating a slow-to-dissipate viscoelastic substance, rather than a simple gel, and it has been proposed that the primary protective effect of the slime is related to impairment of the function of a predator fish's gills. It has been observed that most of the known predators of hagfish are varieties of birds or mammals; it has been proposed that the lack of marine predators can be explained by a "gill-clogging hypothesis", wherein one purpose of the slime is to impair the gill function of marine animals that attempt to prey on the hagfish. If true, it could be regarded as a highly successful evolutionary strategy against predatory fish.
Free-swimming hagfish also "slime" when agitated and will later clear the mucus off by way of the same travelling-knot behavior. The reported gill-clogging effect suggests that the travelling-knot behavior is useful or even necessary to restore the hagfish's own gill function after "sliming".
Research is ongoing regarding the properties and possible applications of the components of hagfish slime filament protein, particularly as a renewable alternative to synthetics currently derived from petroleum. 
Hagfish generally respire through taking in water through their pharynx, past the velar chamber and bringing the water through 6 internal gill pouches. The gill pouches lead to a common aperture on the ventral side of the hagfish. The esophagus is also connected to the common aperture on the ventral side through a pharyngocutaneous duct (esophageocutaneous duct), which has no respiratory tissue. It is likely that this pharyngocutaneous duct is used to cough up indigestible materials. Hagfish also have some cutaneous respiration via the blood sinuses under their skin. This can be essential for hagfish to respire while feeding, since they do not have opercula to beat to produce current across the gills (as in the case of teleost fish).
In December 2007, an article was published by the University of Queensland claiming the hagfish's eye, which lacks both lens and extrinsic musculature, as being significant to the evolution of more complex eyes. Hagfish eyespots, when present, can detect light, but as far as is known none can resolve detailed images. In Myxine and Neomyxine, the eyes are partly covered by the trunk musculature.
Very little is known about hagfish reproduction. In some species, sex ratio has been reported to be as high as 100:1 in favor of females. Some hagfish species are thought to be hermaphroditic, having both an ovary and a testicle (there is only one gamete production organ in both females and males). In some cases it is thought that the ovary remains non-functional until the individual has reached a particular age or encounters a particular environmental stress. These two factors in combination suggest that the survival rate of hagfish is quite high.
Depending on species, females lay from 1 or 2, to 20-30, tough, yolky eggs. These tend to aggregate due to having Velcro-like tufts at either end. Hagfish are sometimes seen curled around small clutches of eggs. It is not certain if this constitutes actual breeding behavior.
Hagfish have a mesonephric kidney and are often neotenic of their pronephric kidney. The kidney(s) are drained via mesonephric/archinephric duct. Unlike many other vertebrates, this duct is separate from the reproductive tract. Unlike all other vertebrates, the proximal tubule of the nephron is also connected with the coelom, provided lubrication.
The single testicle or ovary has no transportation duct. Instead, the gametes are released into the coelom until they find their way to the posterior end of the caudal region, whereby they find an opening in the digestive system.
While polychaete marine worms on or near the sea floor are a major source of nutrition, hagfish can feed upon and often even enter and eviscerate the bodies of dead and dying/injured sea creatures much larger than themselves. They are known to devour their prey from the inside. Hagfish have the ability to absorb dissolved organic matter across the skin and gill, which may be an adaptation to a scavenging lifestyle, allowing hagfish to maximize sporadic opportunities for feeding. From an evolutionary perspective, hagfish represent a transitory state between the generalized nutrient absorption pathways of aquatic invertebrates and the more specialized digestive systems of aquatic vertebrates.
In captivity, hagfish are observed to use the overhand-knot behavior "in reverse" (tail-to-head) to assist them in gaining mechanical advantage to pull out hunks of flesh from carrion fish or cetaceans, eventually making an opening to permit entry to the interior of the body cavity of larger carcasses. It is to be expected that a healthy larger sea creature would be able to outfight or outswim this sort of assault.
However, this energetic opportunism on the part of the hagfish can be a great nuisance to fishermen, as they can devour or spoil entire deep-drag netted catches before they can be pulled to the surface. Since hagfish are typically found in large clusters on and near the bottom, a single trawler's catch could contain several dozen or even hundreds of hagfish as bycatch, and all the other struggling, captive sealife make easy prey for them.
Hagfish are usually not eaten owing to their repugnant looks, as well as their viscosity and unpleasant habits. However, a particular species, the inshore hagfish, found in the Northwest Pacific, is valued as food in the Korean Peninsula. The hagfish is kept alive and irritated by rattling its container with a stick, prompting it to produce slime in large quantities. This slime is used in a similar manner as egg whites in various forms of cookery in the region.
In recent years hagfish have become of special interest for genetic analysis investigating the relationships among chordates. Their classification as agnathans places hagfish as elementary vertebrates in between invertebrates and gnathostomes. However there has been long discussion in scientific literature about whether the hagfish were even non-vertebrate. This position is supported by recent molecular biology analyses which tend to classify hagfish as invertebrates within subphylum Craniata, because of their molecular evolutionary distance from Vertebrata (sensu stricto). A single fossil of hagfish shows that there has been little evolutionary change in the last 300 million years.
As of February 2011, about 77 species are known, in 5 genera (two are being retained in the no-longer recognized genus Paramyxine and are awaiting taxonomic issues to be resolved before being transferred to Eptatretus (see below)). A number of the species have only been recently discovered, living at depths of several hundred metres.
- Paramyxine (Note that this genus is considered synonymous with Eptatretus and most species have been moved into that genus with the exception of the following two which are homonyms of current Eptatretus species. Since the current Eptatretus species are junior (i.e., described later) to the two following species, they must be renamed and then the two remaining "paramyxines" will be transferred to Eptatretus.)
- Myxini - University of California Museum of Paleontology
- Janvier, P. 2010. "MicroRNAs revive old views about jawless vertebrate divergence and evolution." Proceedings of the National Academy of Sciences (USA) 107:19137-19138.  "Although I was among the early supporters of vertebrate paraphyly, I am impressed by the evidence provided by Heimberg et al. and prepared to admit that cyclostomes are, in fact, monophyletic. The consequence is that they may tell us little, if anything, about the dawn of vertebrate evolution, except that the intuitions of 19th century zoologists were correct in assuming that these odd vertebrates (notably, hagﬁshes) are strongly degenerate and have lost many characters over time."
- Rothschild, Anna (2013-04-01). "Hagfish slime: The clothing of the future?". BBC News Online. Retrieved 2013-04-02.
- "Snotties at Southern Encounter". Southern Encounter Aquarium and Kiwi House. 2007-10-30. Retrieved 2008-10-30.
- Lim, J; Fudge, DS; Levy, N; Gosline, JM (January 31, 2006). "Hagfish slime ecomechanics: testing the gill-clogging hypothesis". Journal of Experimental Biology 209 (Pt 4): 702–710. doi:10.1242/jeb.02067. PMID 16449564. Retrieved 2009-01-25.
- "Martini, F. H. (1998). The ecology of hagfishes. The Biology of Hagfishes (ed. J. M. Jorgensen, J. P. Lomholt, R. E. Weber and H. Malte), pp. 57-77. London: Chapman and Hall.", The Biology of Hagfishes (ed. J. M. Jorgensen, J. P. Lomholt, R. E. Weber and H. Malte), pp. 57-77. London: Chapman and Hall.
- "Strahan, R. (1963). The behavior of myxinoids. Acta Zool. 44, 73-102.", Acta Zool. 44, 73-102.
- "Hagfish slime: the clothing of the future?". 2013-04-02. Retrieved 2013-04-02.
- "Keeping an eye on evolution". PhysOrg.com. 2007-12-03. Retrieved 2007-12-04.
- Hyperotreti - Hagfishes
- Hagfish - World's weirdest animals[dead link]
- Glover, CN; Bucking, C, Wood, CM (2011-03-02). "Adaptations to in situ feeding: novel nutrient acquisition pathways in an ancient vertebrate.". Proceedings. Biological sciences / the Royal Society 278 (1721): 3096–101. doi:10.1098/rspb.2010.2784. PMID 21367787.
- "Introduction to the Myxini". Berkeley.edu website. Retrieved 2009-01-25.
- Lesser, M (3 January 1997). "Ecology of the hagfish, Myxine glutinosa L. in the Gulf of Maine I. Metabolic rates and energetics". Journal of Experimental Marine Biology and Ecology 208 (1–2): 215–225. doi:10.1016/S0022-0981(96)02665-2. Retrieved 2009-01-25.
- Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
- Fishbase - Eptatretus burgeri
- "Myxinidae Information". Mudminnow Information Services. Retrieved 2010-08-05.
Further reading 
- Froese, Rainer, and Daniel Pauly, eds. (2011). "Myxinidae" in FishBase. February 2011 version.
- Mincarone, Michael M.; Stewart, Andrew L. (2006). "New species Eptatretus goliath". BIOONE Online Journals 6 (2): 225. doi:10.1643/0045-8511(2006)6[225:ANSOGS]2.0.CO;2. ISSN 0045-8511. Retrieved 2008-02-19.
- J.M. Jørgensen, J.P. Lomholt, R.E. Weber and H. Malte (eds.) (1997). The biology of hagfishes. London: Chapman & Hall.
- Delarbre et al.; Gallut, C; Barriel, V; Janvier, P; Gachelin, G (2002). "Complete Mitochondrial DNA of the Hagfish, Eptatretus burgeri: The Comparative Analysis of Mitochondrial DNA Sequences Strongly Supports the Cyclostome Monophyly". Molecular Phylogenetics and Evolution 22 (2): 184–192. doi:10.1006/mpev.2001.1045. PMID 11820840.
- Bondareva and Schmidt; Schmidt, EE (2003). "Early Vertebrate Evolution of the TATA-Binding Protein, TBP". Molecular Biology and Evolution 20 (11): 1932–1939. doi:10.1093/molbev/msg205. PMC 2577151. PMID 12885957.
- Ewoldt, R. H., Winegard, T. M. and Fudge D. S. (2010). Non-linear viscoelasticity of hagfish slime. Int. J. Lin. Mech. 46: 627-636.
- Fudge, D. (2001). Hagfishes: Champions of Slime Nature Australia, Spring 2001 ed., Australian Museum Trust, Sydney. pp. 61–69.
- Fudge, D. S., Gardner, K. H., Forsyth, V. T., Riekel, C. and Gosline, J. M. (2003) "The mechanical properties of hydrated intermediate filaments: Insights from hagfish gland thread cells" Biophys. J. 85: 2015–2027.
- Fudge, D. S., Hillis, S., Levy, N. and Gosline, J. M. (2010) "Hagfish slime threads as a biomimetic model for high performance protein fibres" Bioinsp. Biomim. 5: 1–8.
- Fudge, D. S., Levy, N., Chiu, S. and Gosline, J. M. (2005) "Composition, morphology and mechanics of hagfish slime" J. Exp. Biol. 208: 4613–4625.
- Lim, J., Fudge, D. S., Levy, N. and Gosline, J. M. (2006) "Hagfish slime ecomechanics: testing the gill-clogging hypothesis" J. Exp. Biol. 209: 702–710.
- Winegard, T. M. and Fudge, D. S. (2010) "Deployment of hagfish slime thread skeins requires the transmission of mixing forces via mucin strands" J. Exp. Biol. 213: 1235–1240.
- Zintzen V, Roberts CD, Anderson MJ, Stewart AL, Struthers CD, Harvey ES (2011) "Hagfish predatory behaviour and slime defence mechanism" Scientific Reports, 1 (131). doi:10.1038/srep00131
Further reading 
- Bardack, D. (1991). First fossil hagfish (Myxinoidea): a record from the Pennsylvanian of Illinois. Science, 254, 701-703.
- Bardack, D., and Richardson, E. S. Jr. (1977). New agnathous fishes from the Pennsylvanian of Illinois. Fieldiana: Geology, 33, 489-510.
- Brodal, A. and Fänge, R. (ed.) (1963). The Biology of Myxine, Universitetsforlaget, Oslo.
- Fernholm, B. and Holmberg, K. (1975). The eyes in three genera of hagfish (Eptatretus, Paramyxine and Myxine) - A case of degenerative evolution. Vision Research, 15, 253-259.
- Hardisty, M. W. (1982). Lampreys and hagfishes: Analysis of cyclostome relationships. In The Biology of Lampreys, (ed. M. W. Hardisty and I. C. Potter), Vol.4B, pp. 165–259. Academic Press, London.
- Janvier, P. (1996). Early vertebrates. Oxford Monographs in Geology and Geophysics, 33, Oxford University Press, Oxford.
- Marinelli, W. and Strenger, A. (1956). Vergleichende Anatomie und Morphologie der Wirberltiere. Myxine glutinosa. Franz Deuticke, Vienna.
- Yalden, D.W. (1985). Feeding mechanisms as evidence for cyclostome monophyly. Zoological Journal of the Linnean Society. 84, 291-300.
- Stock, D. W. and Whitt, G. S. (1992). Evidence from 18S ribosomal RNA that lampreys and hagfishes form a natural group. Science, 257, 787-789.
|Wikimedia Commons has media related to: Myxinidae|
|Wikisource has the text of the 1905 New International Encyclopedia article Hagfish.|
- FishBase entry for Myxinidae
- OceanLink description of hagfish
- Tree of life illustration showing hagfish's relation to other organisms
- YouTube 5+ minute video of Scripps scientist/diver on hagfish
- Metacafe video of a University of Alberta grad student showing slime production of hagfish while in Bamfield, British Columbia
- Beware the hagfish - repeller of sharks 3 News, 28 Oct 2011. Video.
- Hagfish versus sharks : 1-0 Te Papa Blog, 28 October 2011.
- Teen Spots Hagfish-Slurping Elephant Seal - YouTube (2:11)
- What happens when a shark attacks a hagfish - BBC (0:39)