Most came from the mega-shark, but several smaller teeth were also found from the sixgill shark (Hexanchus
), which still exists today.
Reaching up to 15 feet long, the bluntnose sixgill shark (Hexanchus
griseus) is one of the largest sharks in the world, but uncommon in the area.
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
bifrons, Dimya pamplonensis and indeterminate ostreoids, the barnacle Arcoscalpellum sp., echinoid spines and test fragments (Cidaridae and others), asteroid ossicles, and the chondrichthyans Hexanchus
agassizi, Macrorhizodus praecursor, Anomotodon sp.
(5.) These sharks are the primitive species Hexanchus
griseus, the six-gilled or cow shark, its Cuban common name tiburdn canabota.
_: Abstract.- The first records of the bluntnose sixgill shark Hexanchus
grisues and the bramble shark Echinorhinus brucus from southern Oman are reported.
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.
New records of the sharks Isurus and Hexanchus
from the Eocene of Seymour Island, Antarctica.
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.
En los muestreos realizados se reportaron Mustelus canis, Hexanchus
nakamurai y Squalus cubensis, por primera vez para las pesquerias deportivas de la region noroccidental de Cuba.