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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 ...
4 Pelagic species. 5 Reef-associated species. ... Print/export Download as PDF; ... There are 44 species of shark found in the Red Sea. [1] This list is not ...
The blacktip reef shark is a species of requiem shark, family Carcharhinidae, easily identified by the prominent black tips on its fins. It is among the most abundant sharks inhabiting the tropical coral reefs of the Indian and Pacific Oceans , and prefers shallow, inshore waters.
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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]
The pelagic thresher (Alopias pelagicus) is a species of thresher shark, family Alopiidae; this group of sharks is characterized by the greatly elongated upper lobes of their caudal fins. The pelagic thresher occurs in the tropical and subtropical waters of the Indian and Pacific Oceans , usually far from shore, but occasionally entering ...
A mysterious shark that may count as the world’s largest predatory fish appears to be in decline off the U.S., prompting a rush to gather as much information as possible about the secretive ...
The species was identified as being of a new species in its own family, Megachasmidae. [5] Examination of the 4.5-meter (15 ft), 750-kilogram (1,650 lb) specimen by Leighton Taylor showed it to be an entirely unknown type of shark, making it – along with the coelacanth – one of the more sensational discoveries in 20th-century ichthyology. [6]