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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 ...
Sharks are found in all seas. They generally do not live in fresh water, with a few exceptions such as the bull shark and the river shark which can swim both in seawater and freshwater. [99] Sharks are common down to depths of 2,000 metres (7,000 ft), and some live even deeper, but they are almost entirely absent below 3,000 metres (10,000 ft).
List of sharks in the Red Sea. ... There are 44 species of shark found in the Red Sea. [1] This list is not exhaustive. Bathydemersal species. Scientific name
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
Marine ecosystems can be divided into many zones depending upon water depth and shoreline features. The oceanic zone is the vast open part of the ocean where animals such as whales, sharks, and tuna live. The benthic zone consists of substrates below water where many
Requiem sharks are sharks of the family Carcharhinidae in the order Carcharhiniformes. They are migratory, live-bearing sharks of warm seas (sometimes of brackish or fresh water) and include such species as the bull shark, lemon shark, blacktip shark, and whitetip reef shark. Family members have the usual carcharhiniform characteristics.
Tiger sharks are large species that reside in tropical and temperate waters and are among sharks most cited by the International Shark Attack File (ISAF) for unprovoked attacks on humans (Getty ...
The bull shark, Carcharhinus leucas, can swim between salt and fresh water, and are found in tropical rivers around the world. The river sharks (of the genus Glyphis ) can live in both saltwater and freshwater as well, while one of their members, the Ganges shark ( Glyphis gangeticus ), lives exclusively in freshwater.