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Carcharhiniformes

Ground sharks
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Chondrichthyes
Order:Carcharhiniformes
Families
Scyliorhinidae (cat sharks)
Proscyllidae (finback cat sharks)
Pseudotriakidae (false cat sharks)
Leptochariidae (barbeled houndshark)
Triakidae (hound sharks)
Hemigaleidae (weasel sharks)
Carcharhinidae (requiem sharks)

The ground sharks, order Carcharhiniformes, are the largest order of sharks, with over 270 species, and includes a number of common types, such as the blue shark, and sandbar shark. They are also called "whaler sharks".

Members of the orders are characterized by the presence of a nictitating membrane over the eye, two dorsal fins, an anal fin, and five gill slits.

The families of the carcharhiniforms are expected to be revised; recent DNA studies show that some of the traditional groups are not monophyletic.

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