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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 hammerhead sharks are a group of sharks that form the family Sphyrnidae, named for the unusual and distinctive form of their heads, which are flattened and laterally extended into a cephalofoil (a T-shape or "hammer"). The shark's eyes are placed one on each end of this T-shaped structure, with their small mouths directly centered and ...
The shark caught near Su’ao was the largest goblin shark ever caught in Taiwan, the museum said. The massive female shark weighed about 1,763 pounds and reached about 15.4 feet in length, Taiwan ...
The Ginglymostomatidae are a cosmopolitan family of carpet sharks known as nurse sharks, containing four species in three genera. [4] Common in shallow, tropical and subtropical waters, these sharks are sluggish and docile bottom-dwellers. [5] They are the most abundant species of shark found in shallow coastal waters. [6]
Most shark reports concern the more common varieties, but there are more than 400 known species of sharks, and some of them are very rare. Frilled sharks, often called 'living fossils' are one of ...
The new species of ghost shark lives exclusively in the deep waters of Australia and New Zealand, according to NIWA. ... The assessment in 2020 also found that 15 per cent of ghost shark species ...
However, as some other Oxynotus species, the Caribbean roughshark does not have an anal fin. It has the typical shark coarse dermal denticles, but these are atypically large for the size of the shark. It contains small, circular spiracles at the dorsal base of its head. The supraorbital ridges are not expanded and do not form a knob in front of ...
The daggernose shark (Isogomphodon oxyrhynchus) is a little-known species of requiem shark, in the family Carcharhinidae, and the only extant member of its genus.It inhabits shallow tropical waters off northeastern South America, from Trinidad to northern Brazil, favoring muddy habitats such as mangroves, estuaries, and river mouths, though it is intolerant of fresh water.