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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 ...
Pleurotremata. Selachii. Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha[ 1 ] (or Selachii) and are the sister group to the Batoidea (rays and kin).
Ferreira describes the four encounters with the giant shark he participated in with great detail in his book Great White Sharks On Their Best Behavior. [79] One contender in maximum size among the predatory sharks is the tiger shark (Galeocerdo cuvier). While tiger sharks, which are typically both a few feet smaller and have a leaner, less ...
The tiger shark (Galeocerdo cuvier) [ 3 ] is a species of ground shark, and the only extant member of the genus Galeocerdo and family Galeocerdonidae. It is a large macropredator, with females capable of attaining a length of over 5 m (16 ft 5 in). [ 4 ] Populations are found in many tropical and temperate waters, especially around central ...
Whale sharks' lifespans are estimated to be between 80 and 130 years, based on studies of their vertebral growth bands and the growth rates of free-swimming sharks. [9] [10] [11] Whale sharks have very large mouths and are filter feeders, which is a feeding mode that occurs in only two other sharks, the megamouth shark and the basking shark.
Diet and nutrition. Sharks are very frequently overfed by amateur aquarists, which can lead to obesity or unnaturally fast growth rates. [7] Captive sharks are healthiest when fed at levels similar to their food intake in the wild. [7] Usually this amounts to 1-3% of their body weight weekly. [7] However, aquarium conditions and species ...
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 ...
Carpet sharks are sharks classified in the order Orectolobiformes / ɒrɛkˈtɒləbɪfɔːrmiːz /. Sometimes the common name "carpet shark" (named so because many species resemble ornately patterned carpets) is used interchangeably with "wobbegong", which is the common name of sharks in the family Orectolobidae. Carpet sharks have five gill ...