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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 ...
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In most oviparous shark species, an egg case with the consistency of leather protects the developing embryo(s). These cases may be corkscrewed into crevices for protection. The egg case is commonly called a mermaid's purse. Oviparous sharks include the horn shark, catshark, Port Jackson shark, and swellshark. [80] [82]
List of fatal shark attacks in the United States; Jersey Shore shark attacks of 1916 – series of shark attacks along the coast of New Jersey between July 1 and July 12, 1916 [4] Summer of the Shark – the name given to the summer of 2001 by American media outlets capitalizing on a bull shark attack and subsequent shark attacks [5]
Sharks portal; Sharks constitute the superorder Selachimorpha in the subclass Elasmobranchii in the class Chondrichthyes.The Elasmobranchii also include rays and skates; the Chondrichthyes also include Chimaeras.
Two marine biologists share 10 shark facts for kids, as well as why shark attacks happen and why sharks are essential to human survival.
In this screen capture, Jill Horner a recent transplant to the area from Buffalo, N.Y., captured video of a shark swimming off Hilton Head Island on Sept. 4, 2022, Labor Day weekend.
All three thresher shark species have been listed as vulnerable by the World Conservation Union since 2007 (IUCN). [2] All three are popular big-game sport fish, [3] and additionally they are hunted commercially for their meat, livers (for shark liver oil), skin (for shagreen) and fins (for use in delicacies such as shark-fin soup).