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Carcharhiniformes
| Ground sharks | ||||||||
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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. 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.
- Order Carcharhiniformes (http://www.elasmo-research.org/education/shark_profiles/carcharhiniformes.htm)
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