Telatrygon acutirostra
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Telatrygon acutirostra |
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| ( Nishida & Nakaya , 1988) |
Telatrygon acutirostra is a species of stingray and lives in the northwestern Pacific off the coast of southern Japan and in the East China Sea . Like all stingrays, it has a poisonous sting.
features
Telatrygon acutirostra has a pectoral fin disc that is about as long as it is wide; the snout has the shape of an elongated triangle. The eyes are small, behind them are slightly larger injection holes. Between the breathing holes there is a flap of skin with a fringed hem on the back. The upper jaw has 40 to 51 teeth, the lower jaw 39 to 49 teeth, which are grouped in a kind of quincunx pattern. Only in adult male specimens are the teeth jagged. The pelvic fins are wide and triangular. The tail is whip-like and longer than the disc. It has one or two barbed poison stings on the top. There are 20 tubercles along the middle of the spine and 16 above the spine . The top is light brown and the underside white. The type specimen has a disc diameter of 72.5 cm and is therefore considerably larger than most of the comparative specimens .
Way of life
The species lives close to the coast on and above the sea floor in the northwestern Pacific at depths between 53 and 142 m. But there are also reports of sightings of larger animals at depths of up to 420 m as well as sightings from the Gulf of Guayaquil off Ecuador . Telatrygon acutirostra is ovoviviparous with litters of two to six young animals. Practically nothing is known about the rest of the way of life.
Systematics and research history
The species was only in 1988 under the scientific name dasyatis acutirostra described . In the previous decades, the specimens of Dasyatis acutirostra were assigned to the species Dasyatis zugei . The intermingling of the two species has existed since Jordan and Fowler's work on Japanese Elasmobranchs in 1903. In 1988, Kiyonori Nishida and Kazuhiro Nakaya published a study of the Dasyatis species complex with the first description of Dasyatis acutirostra . The type specimen is an adult male with a disc diameter of 72.5 cm, which was caught in the East China Sea in 1968 and is stored at the University of Hokkaidō . The specific epithet acutirostra comes from the Latin words acutus for "pointed" and rostrum for " snout ". The Japanese vernacular name is Yajiri-ei. When the Dasyatidae was revised in mid-2016 , the species was placed in the newly introduced genus Telatrygon .
literature
- DS Jordan and HW Fowler: A review of the elasmobranchiate fishes of Japan. Proceedings of the United States National Museum 26 (1324), pp. 593-674, 1903
- Kiyonori Nishida and Kazuhiro Nakaya: A new species of the genus Dasyatis (Elasmobranchii: Dasyatididae) from Southern Japan and lectotype designation of D. zugei. Japanese Journal of Ichthyology, 35, 2, pp. 115–123, 1988 (first description), full text (PDF, English; 1.7 MB)
Individual evidence
- ^ DS Jordan and HW Fowler: A review of the elasmobranchiate fishes of Japan. Proceedings of the United States National Museum 26 (1324), pp. 593-674, 1903
- ↑ Kiyonori Nishida and Kazuhiro Nakaya: A new species of the genus Dasyatis (Elasmobranchii: Dasyatididae) from Southern Japan and lectotype designation of D. zugei. Japanese Journal of Ichthyology, 35, 2, pp. 115-123, 1988, p. 116
- ↑ 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
- Telatrygon acutirostra on Fishbase.org (English)
- Telatrygon acutirostra on the IUCN Red List