Trisha Shetty (Editor)

Cow shark

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Kingdom  Animalia
Scientific name  Hexanchidae
Phylum  Chordata
Rank  Family
Superorder  Selachimorpha
Subclass  Elasmobranchii
Higher classification  Hexanchiformes
Order  Hexanchiformes
Cow shark Everything You Need to Know About Shark Diving Diviac Magazine
Lower classifications  Bluntnose sixgill shark, Hexanchus, Broadnose sevengill shark, Sharpnose sevengill shark

Cow sharks


Cow sharks are a family, the Hexanchidae, of sharks characterized by an additional pair or pairs of gill slits. Its 37 species are placed within the 10 genera Gladioserratus, Heptranchias, Hexanchus, Notidanodon, Notorynchus, Pachyhexanchus, Paraheptranchias, Pseudonotidanus, Welcommia, and Weltonia.

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Cow shark Cow Shark Facts and Information Notorynchus Sevengill amp Hexanchus

Cow sharks are considered the most primitive of all the sharks, as their skeletons resemble those of ancient extinct forms, with few modern adaptations. Their excretory and digestive systems are also unspecialised, suggesting they may resemble those of primitive shark ancestors. In fact, a possible hexanchid tooth is known from the Permian of Japan, making the family a possible extant survivor of the Permian-Triassic extinction.

Cow shark fishesofaustralianetauimagesfamilyhexanchidaegif

Their most distinctive feature, however, is the presence of a sixth, and, in two genera, a seventh, gill slit, in contrast to the five found in all other sharks. They range from 1.4 to 5.5 m (4.6 to 18.0 ft) in adult body length.

Cow shark Cow Shark

Cow sharks are ovoviviparous, with the mother retaining the egg cases in her body until they hatch. They feed on relatively large fish of all kinds, including other sharks, as well as on crustaceans and carrion.

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Searching for the prehistoric cow shark


Species

The 37 species of cow shark, in 10 genera, are:

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  • Gladioserratus Underwood, Goswami, Prasad, Verma & Flynn, 2011
  • Gladioserratus aptiensis Pictet, 1864
  • Gladioserratus dentatus Guinot, Cappetta & Adnet, 2014
  • Gladioserratus magnus Underwood, Goswami, Prasad, Verma & Flynn, 2011
  • Heptranchias Rafinesque, 1810
  • Heptranchias perlo (Bonnaterre, 1788) (sharpnose sevengill shark)
  • Heptranchias ezoensis Applegate & Uyeno, 1968
  • Heptranchias howellii Reed, 1946
  • Heptranchias karagalensis Kozlov in Zhelezko & Kozlov, 1999
  • Heptranchias tenuidens Leriche, 1938
  • Hexanchus Rafinesque, 1810
  • Hexanchus griseus (Bonnaterre, 1788) (bluntnose sixgill shark)
  • Hexanchus nakamurai Teng, 1962 (bigeyed sixgill shark)
  • Hexanchus agassizi Cappetta, 1976
  • Hexanchus andersoni Jordan, 1907
  • Hexanchus casieri Kozlov, 1999
  • Hexanchus collinsonae Ward, 1979
  • Hexanchus gracilis Davis, 1887
  • Hexanchus hookeri Ward, 1979
  • Hexanchus microdon Agassiz, 1843
  • Hexanchus tusbairicus Kozlov in Zhelezko & Kozlov, 1999
  • Notidanodon Cappetta, 1975
  • Notidanodon brotzeni Siverson, 1995
  • Notidanodon dentatus Woodward, 1886
  • Notidanodon lanceolatus Woodward, 1886
  • Notidanodon loozi Vincent, 1876
  • Notidanodon pectinatus Agassiz, 1843
  • Notorynchus Ayres, 1855
  • Notorynchus cepedianus (Péron, 1807) (broadnose sevengill shark)
  • Notorynchus borealus Jordan & Hannibal, 1923
  • Notorynchus kempi Ward, 1979
  • Notorynchus lawleyi Cigala Fulgosi, 1983
  • Notorynchus primigenius Agassiz, 1843
  • Notorynchus serratissimus Agassiz, 1843
  • Notorynchus subrecurvus Oppenheimer, 1907
  • Pachyhexanchus Cappetta, 1990
  • Pachyhexanchus pockrandti Ward & Thies, 1987
  • Paraheptranchias Pfeil, 1981
  • Paraheptranchias repens Probst, 1879
  • Pseudonotidanus Underwood & Ward, 2004
  • Pseudonotidanus semirugosus Underwood & Ward, 2004
  • Welcommia Klug & Kriwet, 2010
  • Welcommia bodeuri Cappetta, 1990
  • Welcommia cappettai Klug & Kriwet, 2010
  • Weltonia Ward, 1979
  • Weltonia ancistrodon Arambourg, 1952
  • Weltonia burnhamensis Ward, 1979

  • Cow shark Cow Sharks Scuba Diving Blog

    References

    Cow shark Wikipedia


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