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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 556 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
[11] [13] Sharks are also killed for their flesh in Europe and elsewhere. [14] The 2007 film Sharkwater documents ways in which sharks are being hunted to extinction. [15] In 2009, the IUCN Shark Specialist Group reported on the conservation status of pelagic (open water) sharks and rays. They found that over half the pelagic sharks targeted by ...
Shark skeletons are very different from those of bony fish and terrestrial vertebrates. Sharks and other cartilaginous fish (skates and rays) have skeletons made of cartilage and connective tissue. Cartilage is flexible and durable, yet is about half the normal density of bone. This reduces the skeleton's weight, saving energy. [31]
The average shark bite can generate up to 40,000 pounds of pressure per square inch; however, your odds of getting attacked and killed by a shark are only 1 in almost 3.5 million.
A shark bite was found on the right side of his body. [62] Gerbacio Solano, 40: December 3, 1952: Tiger Shark: Solano was killed by an extremely large shark described by witnesses as being in excess of 22 feet (6.7 m) while swimming from his fishing boat, setting nets, at Maile Beach, Oahu, Hawaii. [62] Arthur Barry Lyle Wilson, 17: December 7 ...
The number of shark attacks, including deadly bites, dropped substantially worldwide in 2024, according to a new report. Shark attacks dropped in 2024. Here's where most bites occurred.
Unprovoked attacks by sharks declined sharply in 2024, according to new figures from an international database compiled by the Florida Museum of Natural History. Shark attacks declined sharply in ...
Chondrichthyes includes sharks, rays, skates, and sawfish. There are 313 species and two subpopulations of cartilaginous fish assessed as least concern. Rays and skates