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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 ...
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. [61] 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.
Sharks are split into eight orders: Carcharhiniformes: ground sharks, the largest order of sharks, including requiem sharks, catsharks, swellsharks, houndsharks, weasel sharks and hammerheads; Heterodontiformes: bullhead sharks; Hexanchiformes: cow sharks and frilled sharks; Lamniformes: mackerel sharks, including thresher sharks
There are various types of sharks There are more than 400 shark species. And although most people are familiar with a few specific species, such as the great whites, there are all different types ...
Threatened species are also referred to as a red-listed species, as they are listed in the IUCN Red List of Threatened Species. [4] In a milestone decision in 2013, CITES prohibited international trade in the fins of the scalloped hammerhead (pictured) and four other shark species. [5]
This article lists several species of reef-associated sharks which are known by the common name reef sharks. In the Indian and Pacific Oceans: Blacktip reef shark; Grey reef shark; Whitetip reef shark; In the Atlantic and Pacific Oceans: Galapagos shark; In the Atlantic Ocean: Caribbean reef shark
These species of bigger, more-lengthy sharks can include great whites, bull sharks, big tiger sharks, great hammerheads, scalloped hammerheads, lemon sharks, spinner sharks, sandbar sharks and ...
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.