Nark japonica

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Nark japonica
Drawing by Samuel Garman

Drawing by Samuel Garman

Systematics
Subclass : Plate gill (Elasmobranchii)
without rank: Stingray (batoidea)
Order : Electric rays (Torpediniformes)
Family : Sleeper rays (Narkidae)
Genre : Nark
Type : Nark japonica
Scientific name
Nark japonica
( Temminck & Schlegel , 1850)
The distribution area of Narke japonica on the East Asian coast

Narke japonica is a small ray from the family of sleeper rays(Narkidae). He lives in the western Pacific on the coast of East Asia from Hong Kong to Taiwan to South Japan and South Korea.

features

Narke japonica grows to a length of 35 to 37 centimeters. The body disc is almost circular, the rostrum is short, the tail is broad and flat. On the back side, the fish are colored light brown or orange-brown, sometimes with single dark spots. In many specimens, the sides of the tail are lighter than the back. The ventral side of Narke japonica is whitish or cream-colored. The small eyes and the round, much larger spray holes are close together. The nose curtains are short. There are 12 to 14 rows of teeth in each jaw. The only dorsal fin is rounded and is located well behind the rear edge of the pelvic fins. The caudal fin is much larger than the dorsal fin and also rounded. The pelvic fins are wider than they are long. The clasps of the males reach over the rear edge of the pelvic fins.

Narke japonica can be distinguished from other species of the genus Narke by the color of the back and its body proportions.

Way of life

Nark japonica is relatively common on the coast of Taiwan and southern Japan. Little is known about the behavior and way of life of the rays. They live close to the coast at depths of up to 100 meters.

Systematics

The stingray species was scientifically described for the first time in 1801 by the Dutch zoologist Coenraad Jacob Temminck and his German colleague Hermann Schlegel as Torpedo japonica . Japan was given as Terra typica . Today the species belongs to the genus Narke , which was introduced in 1826 by the German zoologist Johann Jakob Kaup . Under the name Crassinarke dormitor , prepared specimens were described that had a narrower body, narrower pelvic fins, a smaller dorsal and caudal fin and a longer tail. The differences are probably the result of careless preparations and Crassinarke dormitor is now a synonym for Narke japonica .

Individual evidence

  1. ↑ a b c d e Last, PR, White, WT, Carvalho, MR, Séret, B., Stehmann, M. & Naylor, GJP Rays of the World. CSIRO Publishing: Melbourne. ISBN 9780643109131 . Page 179.
  2. ↑ Kent E. Carpenter & Volker H. Niem: The Living Marine Resources of the Western Central Pacific. Volume 3. Batoid fishes, chimaeras and Bony fishes part 1 (Elopidae to Linophrynidae). Rome, FAO. 1998, ISBN 92-5-104302-7 . Page 1446.
  3. ↑ Narke in the Catalog of Fishes (English)

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