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The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
The megamouth shark is an extremely rare species of deepwater shark, and the smallest of the three filter-feeding sharks. Since its discovery in 1976, only a few megamouth sharks have been seen, with 55 specimens known to have been caught or sighted as of 2012, including three recordings on film.
The hammerhead sharks are a group of sharks that form the family Sphyrnidae, named for the unusual and distinctive form of their heads, which are flattened and laterally extended into a cephalofoil (a T-shape or "hammer"). The shark's eyes are placed one on each end of this T-shaped structure, with their small mouths directly centered and ...
The new species of ghost shark lives exclusively in the deep waters of Australia and New Zealand, according to NIWA. ... The assessment in 2020 also found that 15 per cent of ghost shark species ...
[7] [8] Hatchlings are considered large for sharks, reaching over 14 cm in length by the time they leave the egg case. [8] Bullhead shark eggs typically hatch after 7 to 12 months, depending on the species. [8] The female Japanese bullhead shark has been known to deposit their eggs in one location along with other females, called a "nest". [8]
The hearing sensitivity for most shark species lies between 20 and 1000 Hz. [63] A small opening on each side of their heads (not the spiracle) leads directly into the inner ear through a thin channel. The lateral line shows a similar arrangement, and is open to the environment via a series of openings called lateral line pores. This is a ...
Unlike most sharks and other vertebrates, which have hard tissues like spines that form growth rings (much like the rings inside a tree trunk), Greenland sharks lack these structures, making age ...
Shark attacks on humans are very, very rare. But there are still some places around the world where they are more likely than others. These are the world’s shark hotspots.