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Hexanchiformes
1 reference results for: Hexanchiformes
Wikipedia
Hexanchiformes is the order consisting of the most primitive types of sharks, and numbering just five extant species. Fossil sharks that were apparently very similar to modern sevengill species are known from Jurassic specimens.(Allen, 45)

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.

Classification

Extant species

Family Chlamydoselachidae

Family Hexanchidae (cow sharks)

Extinct species

Family Chlamydoselachidae

Family Heptranchidae

Family Hexanchidae

Family ?Mcmurdodontidae

See also

References

  • Allen, Thomas B. The Shark Almanac. New York: The Lyons Press, 1999. ISBN 1-55821-582-4

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Last updated on Wednesday May 14, 2008 at 22:42:52 PDT (GMT -0700)
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