Platyrhina tangi
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Platyrhina tangi |
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| Iwatsuki , Zhang & Nakaya , 2011 |
Platyrhina tangi is a ray from the family of the thorn-back guitar rays (Platyrhinidae). It lives on the coast of eastern Asia from South Korea via China and Taiwan to northern Vietnam, also on the coasts of southern Japan, but not near the Ryūkyū Islands or the Ogasawara Islands . Thespecies is very rare in the Sea of Japan .
features
According to fishermen, Platyrhina tangi becomes over 70 centimeters long. The largest measured male was 68 centimeters long, the largest female was 64 centimeters long. The body disc is heart-shaped, the muzzle pointed, and the pectoral and ventral fins are rounded. The strong, shark-like tail makes up 54 to 63% of the total length of the fish. The back and tail have a row of thorns on top. This extends on the tail to the second dorsal fin. The two dorsal fins are roughly the same in size and shape and are far apart. On the back side the fish are brownish to gray-brown in color, in the middle darker than on the sides. The middle of the back is darker, the fins are lighter. The ventral side is whitish and usually with some irregular yellow spots. The ventral side of the animals is light-colored, the edges of the pectoral and ventral fins are gray-brown. The close together eyes are small, the wide apart nostrils are narrow. The skin is covered with numerous, in most cases very small, sharp placoid scales and thus appears velvety. Larger scales are located on the sides of the anterior body disc and on the tail. There are three or five thorns in the eye sockets and two each in the back shoulder region.
Platyrhina tangi differs from other species of the genus Platyrhina by only one row of thorns on the upper side of the tail, the lack of thorns in the front shoulder area and large thorns near the eyes. These and the thorns in the neck and shoulder area are surrounded by light, whitish or yellowish pigmented spots.
Way of life
Little is known about the behavior and way of life of Platyrhina tangi . The fish become sexually mature with a length of about 40 cm. Young rays are born from August to November. Immediately afterwards the animals mate again.
Individual evidence
- ↑ a b c d Y. Iwatsuki, K. Miyamoto, K. Nakaya and J. Zhang (2011): A review of the genus Platyrhina (Chondrichthys: Platyrhinidae) from the northwestern Pacific, with descriptions of two new species. Zootaxa No. 2738: 26-40. doi : 10.11646 / zootaxa.2738.1.2
- ↑ a b c P.R. Last, WT White, MR Carvalho, B. Séret, M. Stehmann, GJP Naylor: Rays of the World. CSIRO Publishing: Melbourne. ISBN 9780643109131 . Page 131.
- ↑ Platyrhina tangi on Fishbase.org (English)