Comb-toothed lantern shark
| Comb-toothed lantern shark | ||||||||||||
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| Etmopterus decacuspidatus | ||||||||||||
| Chan , 1966 |
The comb-toothed lantern shark ( Etmopterus decacuspidatus ) is a species of the genus Etmopterus within the lantern sharks (Etmopterinae; also classified as the Etmopteridae family), of which only a single specimen, the holotype , is known so far. The holotype was found in the northwestern Pacific in the area of the Chinese island of Hainan .
Appearance and characteristics
The comb-toothed lantern shark is a small shark, the holotype has a body length of 29 centimeters. It has an elongated body typical of the lantern sharks with a long and at the same time wide and flattened head and a narrow snout. The body color is brown on top, the underside is black. Above the pelvic fins there is a drawing in the form of a narrow line that begins above the fins and leads to them and then towards the caudal fin. There is another black line at the base of the tail stalk. Compared to related species, this shark lacks rows of small and closely spaced tooth scales on the sides of its body. It also has the light organs typical of the lantern sharks on the belly side.
It has two dorsal fins with the orderly spines in front of it, but no anal fin . The first dorsal fin begins well behind the pectoral fins above their rear edge and is only about half the size of the second. The tail is long. Like all species in the family, the animals have five gill slits and an injection hole behind the eye.
The upper teeth each have four or five tooth tips.
distribution
The holotype was found in the northwestern Pacific in the area of the Chinese island of Hainan and the Vietnamese coast. Here it was caught near the ground from a depth of around 510 to 700 meters.
Way of life
The comb-toothed lantern shark lives pelagically or near the ground in the deep sea area of the island shelf . Like other sharks, it feeds in a predatory manner, likely on smaller fish and invertebrates. No data are available on his way of life.
Like other species of order, it is viviparous ( ovoviviparous ).
Systematics
Etmopterus decacuspidatus is an independent species within the lantern shark . It was scientifically described in 1966 by William Lai-Yee Chan , an ichthyologist at the Fisheries Research Institute in Aberdeen, Hong Kong , on the basis of an adult male .
Danger
The comb-toothed lantern shark is not classified in a hazard category in the IUCN Red List due to a lack of data and is instead listed as "data deficient". The lack of known specimens and the little specific information currently available preclude an evaluation. However, the apparently limited range of this species suggests a potential threat. There is no information about the population of the species. Apart from the holotype , no specimens have been caught and examined. There is no information on the fishing pressure, but the region is fished by the Chinese fishing fleets very large and the bycatch is not analyzed in detail.
supporting documents
- ↑ a b Etmopteridae .: Lantern sharks. In: Compagno et al. 2004
- ↑ a b c d e f g Leonard Compagno , Marc Dando, Sarah Fowler: Sharks of the World. Princeton Field Guides, Princeton University Press , Princeton and Oxford 2005; P. 96. ISBN 978-0-691-12072-0
- ↑ a b Comb-toothed Lantern Shark on Fishbase.org (English)
- ↑ a b Etmopterus decacuspidatus in the endangered Red List species the IUCN 2008 Posted by: C. McCormack, 2009. Accessed May 13, 2020th
literature
- Leonard Compagno , Marc Dando, Sarah Fowler: Sharks of the World. Princeton Field Guides, Princeton University Press , Princeton and Oxford 2005; P. 96. ISBN 978-0-691-12072-0
Web links
- Comb-toothed lantern shark on Fishbase.org (English)
