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Encyclopedia > Hexanchiformes
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Hexanchiformes
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Chlamydoselachidae (frilled shark) Hexanchidae[?] (cow sharks) |
Hexanchiformes is the order consisting of the most primitive types of sharks, and numbering just a handful of species.
Hexanchiform sharks have only one dorsal fin[?], either six or seven gill slits[?], and no nictitating membrane[?] in the eyes.
The frilled shark Chlamydoselachus anguineus is very different from the cow sharks, and it has been proposed that it be moved to its own order Chlamydoselachiformes.
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