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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 Lamniformes (/ ˈ l æ m n ɪ f ɔːr m iː z /, from Greek lamna "fish of prey") are an order of sharks commonly known as mackerel sharks (which may also refer specifically to the family Lamnidae). It includes some of the most familiar species of sharks, such as the great white [1] as well as less familiar ones, such as the goblin shark ...
This causes a misconception in about half of the country not being aware that cação is meat from sharks, or mistakenly thinking it is a specific species of shark [9] Shark meat is popular due to its low price and boneless nature. It is one of the most common choices of fish for the local dish Moqueca, [10] a traditional fish stew.
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]
Most batoids have a flat, disk-like body, with the exception of the guitarfishes and sawfishes, while most sharks have a spindle-shaped body. Many species of batoid have developed their pectoral fins into broad flat wing-like appendages. The anal fin is absent. The eyes and spiracles are located on top of the head.
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.
All of which would take more research on the species. Shark research is hard to get funding for, in part, because sharks aren’t a commercial species. Yet the irony is that they affect commercial ...
List of sharks Subdivisions of the biological classification Selachimorpha include: . Carcharhiniformes – ground sharks; Heterodontiformes – bullhead sharks; Hexanchiformes – the five extant species of the most primitive types of sharks