Hemitrygon izuensis
| Hemitrygon izuensis | ||||||||||||
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Hemitrygon izuensis |
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| Scientific name | ||||||||||||
| Hemitrygon izuensis | ||||||||||||
| ( Nishida & Nakaya , 1988) |
Hemitrygon izuensis is a smaller stingray species and has so far only been found on the Pacific coast of the Izu peninsula of the Japanese main island of Honshū .
features
Hemitrygon izuensis has a diamond-shaped pectoral fin disc that is slightly wider than it is long and reaches a maximum width of 42 cm. The front part of the disc ends in a blunt snout. The tail is like a whip, about as long as the disc and has one, rarely two, poisonous sting. The top is golden brown, darker between the eyes and at the back of the tail. The underside is white, darker at the edges of the discs.
Way of life
The ray lives on the continental shelf , mostly at depths between 10 and 20 meters, but there have also been reports of sightings both at depths of up to 480 meters and in fresh water . Little is known about his way of life. It is ovoviviparous with litters of two to six young animals, which are presumably born after a gestation period of around 12 months. Because of its small geographical distribution and the threat adopted by Japanese coastal fishermen have conservation status of which is IUCN with NT (Near Threatened) rated.
Systematics
The ray species was described in 1988 by the Japanese ichthyologists Kiyonori Nishida and Kazuhiro Nakaya under the scientific name Dasyatis izuensis . When the Dasyatidae was revised in mid-2016 , the species was placed in the genus Hemitrygon .
Individual evidence
- ↑ Last, PR, Naylor, GJP & Manjaji-Matsumoto, BM (2016): A revised classification of the family Dasyatidae (Chondrichthyes: Myliobatiformes) based on new morphological and molecular insights. Zootaxa , 4139 (3): 345-368. doi: 10.11646 / zootaxa.4139.3.2
Web links
- Hemitrygon izuensis on Fishbase.org (English)
- Dasyatis izuensis on the IUCN Red List