Glyphis garricki
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Glyphis garricki |
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| Scientific name | ||||||||||||
| Glyphis garricki | ||||||||||||
| Compagno , WT White & Cavanagh , 2008 |
Glyphis garricki is a relatively large species of river sharks ( Glyphis ) within the Requiem sharks (Carcharhinidae). The shark is found in brackish water areas and in the adjacent sea on the coast of the Australian Northern Territory . River sharks in the Fly River in southwest Papua New Guinea could also be this species.
features
Glyphis garricki is 1.45 (males) to 2.50 (females) meters long. It has a stocky body that is gray on the top, white on the underside and otherwise has no further color markings. The fin edges are dark or black. The head is flattened, the short rostrum is broadly rounded when viewed from above or below, the eyes are small, there are no injection holes . In the upper jaw the teeth are wide and triangular with sawn edges, in the lower jaw narrower with a slender tip. The first dorsal fin stands above the rear third of the pectoral fins, the second dorsal fin is two thirds of the height of the first. An interdorsal ridge is missing. The anal fin has a very deep indentation on its rear edge.
The bull shark ( Carcharhinus leucas ) also occurs in the range of Glyphis garricki . Glyphis garricki can be distinguished from it by its larger second dorsal fin and the small eyes that are still in the gray-colored head area, while the bull shark's eyes lie directly on the borderline between the gray upper side and the whitish lower side. In addition, Glyphis garricki is steel gray, in contrast to the yellow gray of the bull shark.
Danger
Glyphis garricki is classified as Critically Endangered on the IUCN Red List . In total, there should be only 250 sexually mature specimens and no subpopulation comprises more than 50 individuals.
supporting documents
- ↑ Glyphis garricki in the endangered Red List species the IUCN 2008. Posted by: Pogonoski, J. & Pollard, D. (SSG Australia & Oceania Regional Workshop, March 2003), 2008. Accessed August 12, 2011th
literature
- Leonard Compagno , Marc Dando, Sarah Fowler: Sharks of the World. Princeton Field Guides, Princeton University Press , Princeton / Oxford 2005, ISBN 0-691-12072-2 , pp. 133-134.
- LJV Compagno, WT White, PR Last: Glyphis garricki sp. nov., a new species of river shark (Carcharhiniformes: Carcharhinidae) from northern Australia and Papua New Guinea, with a redescription of Glyphis glyphis (Müller & Henle, 1839) . In: PR Last, WT White, JJ Pogonoski (Ed.): Descriptions of new Australian Chondrichthyans . CSIRO Marine and Atmospheric Research, 2008, ISBN 978-1-921424-18-2 , pp. 203-226 .
Web links
- Glyphis garricki on Fishbase.org (English)