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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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The use of sight probably varies with species and water conditions. The shark's field of vision can swap between monocular and stereoscopic at any time. [58] A micro-spectrophotometry study of 17 species of sharks found 10 had only rod photoreceptors and no cone cells in their retinas giving them good night vision while making them colorblind.
The blue shark (Prionace glauca), also known as the great blue shark, is a species of requiem shark, ... Photos of Blue shark on Sealife Collection;
Their Sharks of the Salish Sea exhibit educates visitors about all 12 shark species in our waters through specimen loaned from WDFW. From a thresher shark tail to shark jaws, they offer a free ...
The shortfin mako shark is a fairly large species of shark. Growth rates appear to be somewhat accelerated in comparison to other species in the lamnid family. [8] An average adult specimen measures around 2.5 to 3.2 m (8.2 to 10.5 ft) in length and weighs from 60–140 kg (130–310 lb).
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.
Some species, such as the great white shark, are generally more of a winter species around Hilton Head Island, whereas others are predominantly only around in the summer months.