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The bluntnose sixgill is a species of sixgill sharks, of genus Hexanchus, a genus that also consists of two other species: the bigeye sixgill shark (Hexanchus nakamurai) and the Atlantic sixgill shark (Hexanchus vitulus). Through their base pairs of mitochondrial genes COI and ND2, these three species of sixgills widely differ from one another.
The bluntnose sixgill shark, Hexanchus griseus, is relatively common to scientists. However, very little information exists about its distribution patterns, migrations and behavior. However, very little information exists about its distribution patterns, migrations and behavior.
The bigeyed sixgill shark (Hexanchus nakamurai) is a cow shark of the family Hexanchidae. Its dorsal surface has a brownish-gray color, and is sharply separated from the light coloring of its ventral surface. The eyes are a fluorescent green while the shark is alive. The body of this shark is small, slim, and fusiform in shape.
The Atlantic sixgill shark (Hexanchus vitulus) is a rare species of hexanchid shark found in the Atlantic Ocean at depths that are greater than 300 meters. [1] These depths are known as mesopelagic and bathypelagic in tropical and temperate waters around the world. [ 1 ]
A team of scientists recently captured the elusive bluntnose sixgill shark, a deep-sea fish that has been on Earth before dinosaurs, on film.
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Chlamydoselachus anguineus Garman, 1884 (frilled shark) Family Hexanchidae J. E. Gray 1851 (cow sharks) Heptranchias Rafinesque, 1810. Heptranchias perlo (Bonnaterre, 1788) (sharpnose sevengill shark) Hexanchus Rafinesque, 1810. Hexanchus griseus (Bonnaterre, 1788) (bluntnose sixgill shark) Hexanchus nakamurai Teng, 1962 (bigeyed sixgill shark)
Researchers have discovered evidence pointing to the first known case of a porbeagle shark — which can grow up to 12 feet long and 500 pounds — being killed by a large shark predator.