Irrawaddy river shark

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Irrawaddy river shark
Systematics
without rank: Sharks (selachii)
Superordinate : Galeomorphii
Order : Ground Sharks (Carcharhiniformes)
Family : Requiem sharks (Carcharhinidae)
Genre : River sharks ( Glyphis )
Type : Irrawaddy river shark
Scientific name
Glyphis siamensis
( Steindachner , 1896)

The Irrawaddy river shark ( Glyphis siamensis ) is a type of river shark (genus Glyphis ) within the Requiem shark (Carcharhinidae). This shark is only known from a museum specimen that was caught in the Irrawaddy delta on the coast of Burma in the 19th century . The shark is classified as critically endangered. According to DNA comparisons, the sequences of the holotype of G. siamensis lie within the samples examined by the gangeshai ( Glyphis gangeticus ) and the Irrawaddy river shark would therefore no longer be an independent species.

features

Fishing area

The only known specimen of the Irrawaddy river shark is 60 cm long. The American shark expert Leonard Compagno assumes a maximum length of one to three meters. The shark has a stocky body that is brown-gray on the top, white on the underside and without any markings. The short rostrum is broadly rounded, the eyes are small. The teeth in the upper jaw are wide, triangular and serrated, the first lower jaw teeth have only weakly sawn edges. The beginning of the first dorsal fin lies above the end of the pectoral fin base , the second is half as high as the first. An interdorsal ridge is missing. The anal fin has a strong indentation on its rear edge. The Irrawaddy River Shark differs from the closely related Gangeshai ( Glyphis gangeticus ) in that it has a higher number of vertebrae and a smaller number of teeth.

Danger

The Irrawaddy river shark is classified as Critically Endangered on the IUCN Red List .

supporting documents

  1. ↑ Chenhong Lia, Shannon Corrigan, Lei Yang, Nicolas Straube, Mark Harris, Michael Hofreiter , William T. White and Gavin JP Naylorb: DNA capture reveals transoceanic gene flow in endangered river sharks. 13302-13307 | PNAS | October 27, 2015 | vol. 112 | no.43
  2. ↑ Glyphis siamensis in the endangered Red List species the IUCN 2008. Posted by: Barnett, LAK, Quaranta, KL, Ebert, DA, White, WT & Compagno, Hunting Association, 2008. Accessed August 11, 2011th

literature

  • Leonard Compagno, Marc Dando, Sarah Fowler: Sharks of the World. Princeton Field Guides, Princeton University Press, Princeton and Oxford 2005; Pp. 133-134, ISBN 978-0-691-12072-0 .

Web links