Hemitrygon laevigata
| Hemitrygon laevigata | ||||||||||||
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| Scientific name | ||||||||||||
| Hemitrygon laevigata | ||||||||||||
| ( Chu , 1960) |
Hemitrygon laevigata is a species of stingray and lives on the coasts of the northwestern Pacific off China and Japan .
features
Hemitrygon laevigata has a diamond-shaped pectoral fin disc that is 1.2 to 1.3 times as wide as it is long and ends in a blunt snout towards the front. Males reach a disc width of 20 cm, females 30 cm, which is very small for the Dasyatis genus. The tail is 1.4 to 1.8 times as long as the disc, wider at the base and tapering off like a whip. On the top of its tail it has a poison sting about 4 cm long. The eyes are large and protruding, behind them are roughly equally large, elliptical injection holes. The upper side is yellow-brown, the underside white, towards the edges gray-yellow. There are irregular dark spots on the top and bottom. The tail is dark brown with yellow stripes on the sides.
Way of life
The ray lives in the Yellow and East China Sea close to the coast at depths of up to 50 meters and in river mouths. Little is known about its eating habits. It is ovoviviparous with litters of probably only one or two pups. It is often brought in by coastal fishermen as bycatch and is also marketed in China, while in Japan it is usually not used because of its small size. Because of the strong exploitation of its habitat and its low reproduction rate, he is by the IUCN with NT rated (Near Threatened).
Systematics
The ray species was described in 1841 by the Chinese naturalist Chu Yuan-Ting under the scientific name Dasyatis laevigata . 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 laevigata on Fishbase.org (English)
- Dasyatis laevigata on the IUCN Red List