Hexanchiformes
From Wikipedia, the free encyclopedia
| Hexanchiformes Fossil range: Middle Jurassic–Recent [1] |
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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[2].
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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[edit] Classification
[edit] Extant species
Family Chlamydoselachidae
Family Hexanchidae (cow sharks)
[edit] Extinct species
Family Chlamydoselachidae
- Chlamydoselachus
- Chlamydoselachus bracheri Pfeil, 1983
- Chlamydoselachus gracilis Antunes & Cappetta, 2001
- Chlamydoselachus goliath Antunes & Cappetta, 2001
- Chlamydoselachus fiedleri Pfeil, 1983
- Chlamydoselachus lawleyi Davis, 1887
- Chlamydoselachus thomsoni Richter & Ward, 1990
- Chlamydoselachus tobleri Leriche, 1929
- Thrinax
- Thrinax baumgartneri Pfeil, 1983
Family Heptranchidae
- Heptranchias
- Heptranchias ezoensis Applegate & Uyeno, 1968
- Heptranchias howelii (Reed, 1946)
- Heptranchias tenuidens (Leriche, 1938)
Family Hexanchidae
- Hexanchus
- Hexanchus arzoensis (Debeaumont, 1960)
- Hexanchus agassizi [4]
- Hexanchus collinsonae Ward, 1979
- Hexanchus gracilis (Davis, 1887) [5]
- Hexanchus griseus “andersoni” “gigas” (Bonaterre, 1788)
- Hexanchus hookeri Ward, 1979
- Hexanchus microdon “agassizii” (Agassiz, 1843)
- Hexanchus nakamurai “vitulus” Teng, 1962
- Notidanoides
- Notidanodon
- Notidanodon antarcti Grande & Chatterjee, 1987
- Notidanodon brotzeni Siverson, 1995
- Notidanodon dentatus (Woodward, 1886)
- Notidanodon lanceolatus (Woodward, 1886)
- Notidanodon loozi (Vincent, 1876)
- Notidanodon pectinatus (Agassiz, 1843)
- Notorynchus
- Notorynchus aptiensis (Pictet, 1865)
- Notorynchus intermedius Wagner
- Notorynchus lawleyi Ciola & Fulgosi, 1983
- Notorynchus munsteri (Agassiz, 1843)
- Notorynchus serratissimus (Agassiz, 1844)
- Notorynchus serratus (Agassiz, 1844)
- Paraheptranchias
- Paraheptranchias repens (Probst, 1879)
- Paranotidanus “Eonotidanus” contrarius (Munster, 1843)
- Paranotidanus intermedius (Wagner, 1861)
- Paranotidanus munsteri (Agassiz, 1843)
- Paranotidanus serratus (Fraas, 1855)
- Pseudonotidanus
- Pseudonotidanus semirugosus Underwood & Ward, 2004
- Weltonia
- Weltonia ancistrodon (Arambourg, 1952)
- Weltonia burnhamensis Ward, 1979
Family ?Mcmurdodontidae
- Mcmurdodus
- Mcmurdodus featherensis White, 1968
- Mcmurdodus whitei Turner, & Young, 1987
[edit] See also
[edit] References
- ^ "Hexanchiformes". FishBase. Ed. Ranier Froese and Daniel Pauly. January 2009 version. N.p.: FishBase, 2009.
- ^ Allen, 45
- Allen, Thomas B. The Shark Almanac. New York: The Lyons Press, 1999. ISBN 1-55821-582-4
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