Nark dipterygia
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Nark dipterygia |
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| ( Bloch & Schneider , 1801) |
Narke dipterygia is a very small ray from the family of sleeper rays (Narkidae). It lives on the coast of the northern Indian Ocean ( Oman and India ) and the western Pacific ( Malay Peninsula to Japan). It is uncertain whether the species also occurs in Filipino or Indonesian waters.
features
Nark dipterygia usually only grows 8 to 10 inches, but there have been reports of specimens of 14 inches long. In general, the animals in the Arabian Sea get bigger. The body disc is almost circular, the rostrum is short, the tail is broad and flat. On the back side the fish are brownish, greenish or reddish brown in color. In the Arabian Sea the rays are more reddish. There are large whitish or cream-colored spots on the bases of the pectoral and pelvic fins as well as on the base of the tail. The ventral side of nark dipterygia is whitish, sometimes with brownish edges. The small eyes and the much larger spray holes are close together. The nostrils are round, the nasal curtains are short. The teeth are small with round bases and triangular tips. There are 16 to 18 rows of teeth in each jaw. The teeth are not visible from the outside. Males have short and flat clusters that only reach a little above the rear edge of the pelvic fins. The only dorsal fin is rounded and smaller than the caudal fin. The latter is round, oval or slightly trapezoidal. Your lower lobe is small. The pelvic fins are triangular.
Narke dipterygia can be distinguished from other species of the genus Narke by the color of the back.
Way of life
Nark dipterygia is common in some regions of the distribution area, but little is known about the behavior and way of life of the rays. They live close to the coast to a depth of about 100 meters and feed on bristle worms and small crustaceans. The animals become sexually mature with a length of about 15 cm. 4 to 6 young rays are born per litter.
Systematics
The ray species was first scientifically described as Raja dipterygia in 1801 by the German naturalists Marcus Élieser Bloch and Johann Gottlob Theaenus Schneider . The South Indian Tranquebar 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 . It has not yet been clarified whether Narke dipterygia is a single species or a complex of different, closely related species .
Individual evidence
- ↑ 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 178.
- ^ A b c 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 1445.
- ↑ Narke in the Catalog of Fishes (English)
Web links
- Narke dipterygia on Fishbase.org (English)