Shark (Selachimorpha) is the common name of living species classified in Selachimorpha (the other, Batoidea), one of the two superorders that make up the Elasmobranchii subclass of the cartilaginous fishes (Chondrichthyes).
Like stingrays, sharks have more urea in their blood compared to other living things (0.5% - 8%). This rate is about a hundred times higher than that of Teleostei fish.
The number of red blood cells per unit volume of sharks is approximately 5-8 times less than that of Teleostei fish. This deficiency was corrected by magnifying the surface of each red cell approximately five times.
There are about 360 species of sharks in existence today, and they are classified into eight orders. The place of the sharks (Selachimorpha) superorder in the cartilaginous fish (Chondrichthyes) class and the orders it includes are presented below:
Sharks can be found both in the ocean and in freshwater. They are mostly found deep in tropical waters, northern seas, and the Mediterranean.
Crows are members of the Squaliforme family. But in a way, Triakidae and Hexanchiformes species are also known as sharks.
The angel shark is an unknown species and mostly inhabits reef-like areas, and is mistaken for the stingray because of its extreme resemblance to the stingray, but its senses and ferocity distinguish the shark. Its scientific name is Squatina, and its superclass is Squatinidae.
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