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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 reefs, where visibility is high, species of sharks from the family Carcharhinidae have smaller olfactory bulbs. [55] Sharks found in deeper waters also have larger olfactory bulbs. [56] Sharks have the ability to determine the direction of a given scent based on the timing of scent detection in each nostril. [57]
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
Bodies of water in which sharks can be found include: Seas: all; Freshwater – some species of shark can live both in seawater and freshwater, and include: Bull shark; River shark; Sandbar shark; Depths: from the surface down to depths of 2,000 metres (6,600 ft). A whale shark in the Georgia Aquarium
In particular, harvesting young sharks before they reproduce severely impacts future populations. Sharks generally reach sexual maturity only after many years and produce few offspring in comparison to other fish species. [9] Conservationists estimate that up to 100 million sharks are killed by commercial and recreational fishing every year.
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 ...
Ground sharks, like this blacknose shark, have a nictitating membrane which can be drawn over the eye to protect it. Carcharhiniformes / k ɑːr k ə ˈ r aɪ n ɪ f ɔːr m iː z /, the Requiem sharks, are the largest order of sharks, with over 270 species. They include a number of common types, such as catsharks, swellsharks, and requiem sharks.
In fact, at SeaWorld Orlando, kids can touch a shark, learn about different species of shark and even dine at a restaurant where sharks swim past throughout their meal.