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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 ...
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]
Like other members of its family, the grey reef shark is viviparous, meaning that the mother nourishes her embryos through a placental connection. Litters of 1–6 pups are born every other year. Grey reef sharks were the first shark species known to perform a threat display, a stereotyped behavior warning that it is prepared to attack. The ...
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.
Video above: Tail end of shark week celebrated at Shark Con. TAMPA, Fla. (WFLA) — Researchers have confirmed the existence of a new species of shark in South America.
The second largest fish known to humans, the basking shark, can be seen near the coast between May and October every year. ... Perhaps the most famous of all shark species, the possibility of a ...
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]
The females give birth to between 6 to 42 pups every 24 months. Great Hammerhead Shark Facts. ... This species of hammerhead shark is the most recently discovered out of the ten species. It was ...