The bluntnose sixgill shark,
Hexanchus griseus, is the only species of the genus Hexanchus recorded in the Mexican Pacific (Compagno, 1984; Fischer et al., 1995).
The shark -
hexanchus griseus in Latin - spends much of its time in deep water and as a result has very little interaction with humans, with only one reported attack in 500 years.
Preliminary study on the use of neural arches in the age determination of bluntnose sixgill sharks (
Hexanchus griseus).
Keywords: Shark,
Hexanchus griseus, Echinorhinus brucus.
Demersal fish species in Puget Sound are consumed by elasmobranchs, such as Spiny Dogfish (Squalus acanthias) and Bluntnose Sixgill Shark (
Hexanchus griseus), and marine mammals, such as the harbor seal (Phoca vitulina; Bromaghin et al., 2013; Howard et al., 2013) and California sea lion (Zalophus californianus), but we are unaware of any abrupt changes in predator densities in Port Madison to explain these patterns.
The bluntnose sixgill shark (
Hexanchus griseus) has small and narrow upper teeth having a curved cusp and zero to four small cusplets, and large saw-like lower teeth with a cusp and four to seven cusplets gradually decreasing in height (in adults the cusp becomes larger, while in young it is only slightly larger than the first cusplet); the tooth at the symphysis is very different in shape, being narrower and having a cusp without cusplets with strongly serrated margins.
Corona alta y levemente oblicua
Hexanchus griseus 6 (5) Dientes inferiores altos y cortos, sin forma de sierra, una cuspide baja y tres a cuatro cuspides curvadas laterales.
Las restantes especies de elasmobranquios, en orden de importancia, fueron tollo de cachos (Squalus acanthias Linnaeus), tollo comun (Mustelus mento Cope), raya espinuda (Dipturus trachyderma), pejegallo (Callorhynchus callorhynchus Linnaeus) y tiburon gris (
Hexanchus griseus Bonaterre) (Tabla 2).
The rest of the shark species identified were the porbeagle (Lamna nasus), bigeyed thresher shark (Alopias superciliosus), smooth hammerhead (Sphyrna zygaena), bluntnose sixgill shark (
Hexanchus griseus), sandbar shark (Carcharinus plumbeus), longnose spurdog (Squalus blainvillei), smoothhound (Mustelus mustelus), and basking shark (Cetorhinus maximus).
These included Raja spp., Scyliorhinus spp., Torpedo spp., Isurus oxyrinchus, Galeus melastomus, Dasyatidae,
Hexanchus griseus, Lamna nasus, Cetorhinus maximus, Echinorhinus brucus, and Etmopterus spp.
Depth telemetry from the sixgill shark,
Hexanchus griseus, at Bermuda.