Back Elasmobranchii Afrikaans صفيحية الخياشيم الغضروفية Arabic صفيحية الخياشيم الغضروفيه ARZ Elasmobranchii AST Yastıqəlsəməlilər Azerbaijani Пласцінашчэлепныя Byelorussian Пластинчатохрили Bulgarian Elasmobranquis Catalan Pagig-iho CEB Příčnoústí Czech

Elasmobranchii

Elasmobranchii
Temporal range: Wenlock–Recent[1]
Great white shark
(Carcharodon carcharias)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Bonaparte, 1838
Superorders
Elasmobranchs lack swim bladders, and maintain buoyancy with oil that they store in their livers. Some deep sea sharks are targeted by fisheries for this liver oil, including the school, gulper and basking sharks (pictured). All three of these species have been assessed by the IUCN as vulnerable due to overfishing.[2][3][4]
Radiation of elasmobranchs, based on Michael Benton, 2005.[5]

From a practical point of view the life-history pattern of elasmobranchs makes this group of animals extremely susceptible to over fishing. It is no coincidence that the commercially exploited marine turtles and baleen whales, which have life-history patterns similar to the sharks, are also in trouble.

Elasmobranchii is a subclass of the Chondrichthyes or cartilaginous fish. It includes the modern sharks and the rays and skates.

  1. ↑ Märss, Tiiu; Gagnier, Pierre-Yves (2001). "A new chondrichthyan from the Wenlock, Lower Silurian, of Baillie-Hamilton Island, the Canadian Arctic". Journal of Vertebrate Paleontology. 21 (4): 693–701. doi:10.1671/0272-4634(2001)021[0693:ANCFTW]2.0.CO;2. S2CID 86329421.
  2. ↑ Fowler, S.L. (2005). "Cetorhinus maximus". IUCN Red List of Threatened Species. 2005: e.T4292A10763893. doi:10.2305/IUCN.UK.2005.RLTS.T4292A10763893.en.
  3. ↑ "Galeorhinus galeus (School shark)". IUCN Red List of Threatened Species. 2005-06-17. 2005-06-17. Retrieved 2013-03-26.[permanent dead link]
  4. ↑ Guallart; et al. (2006). "Centrophorus granulosus". IUCN Red List of Threatened Species. 2006. Retrieved 11 May 2006.
  5. ↑ Benton, Michael J. (2015). Vertebrate Palaeontology (3rd ed.). Blackwell. p. 185. ISBN 9781118406847. OCLC 945675149.
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