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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 ...
The sandbar shark (Carcharhinus plumbeus), also known as the brown shark or thickskin shark, is a species of requiem shark, and part of the family Carcharhinidae, native to the Atlantic Ocean and the Indo-Pacific. It is distinguishable by its very high first dorsal fin and interdorsal ridge. [2]
Sand tiger shark. The sand tiger shark (Carcharias taurus), grey/gray nurse shark, spotted ragged-tooth shark or blue-nurse sand tiger, is a species of shark that inhabits subtropical and temperate waters worldwide. It inhabits the continental shelf, from sandy shorelines (hence the name sand tiger shark) and submerged reefs to a depth of ...
Carcharodon albimorsWhitley, 1939. The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or simply great white, is a species of large mackerel shark which can be found in the coastal surface waters of all the major oceans. It is the only known surviving species of its genus Carcharodon.
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.
Outline of sharks. A great white shark at Isla Guadalupe, Mexico. The following outline is provided as an overview of and topical guide to sharks: Sharks ( superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 440 million years ago, before the ...
Carcharhinus obscurus, Dusky shark, (Carcharhinidae) Carcharhinus plumbeus, Sandbar shark, (Carcharhinidae) Carcharhinus sorrah, Spottail shark, (Carcharhinidae) Galeocerdo cuvier, Tiger shark, (Carcharhinidae) Negaprion acutidens, Sicklefin lemon shark, (Carcharhinidae) Triaenodon obesus, Whitetip reef shark, (Carcharhinidae) Nebrius ...
The lemon shark (Negaprion brevirostris) is a species of shark from the family Carcharhinidae, known for its yellowish color, which inspires its common name. It is classified as a Vulnerable species by the International Union for the Conservation of Nature. [4] Lemon sharks can grow to 3.4 metres (11 ft) in length.