Platyrhina tangi (lat.) - a species of cartilaginous fish from the family of platyrinous order of tailed-like . These are stingrays leading a bottom lifestyle, with large, flattened pectoral and ventral fins in the shape of a heart-shaped disk, a long tail and two dorsal fins. On the back there are a number of large spines. There are no spines at the base of the tail. They live in the northwestern and centralwestern parts of the Pacific Ocean . The maximum recorded length is 68 cm. These stingrays reproduce by egg-bearing , embryos initially feed on yolk . The diet consists of worms , crustaceans and mollusks [1] [2] .
| Platyrhina tangi |
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| Scientific classification |
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| No rank : | Bilateral symmetrical |
| Suborder : | Platyriform ( Platyrhinoidei McEachran, Dunn & Miyake, 1996 ) |
| Gender: | Chinese disc ramps |
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| International scientific name |
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Platyrhina tangi
Iwatsuki , Miyamoto & Nakaya , 2011 |
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Content
The species was first scientifically described in 2011 [3] . The species is named after the Chinese ichthyologist D. S. Tang, who recognized P. limboonkengi 1933 as a synonym for the Chinese stingray [4] . The holotype is a male, 39.8 cm long, caught off the coast of Miyazaki , Japan ( ). Paratypes: females 9–57 cm long and males 11.6–52.5 cm long, caught there; females 30.3–53.6 cm long and males 32.8–34.1 cm long, caught off the coast of Nagasaki; female 63.7 cm long, caught in the waters of Shizuoka [5] .
Platyrhina tangi live in the temperate waters of the northwestern Pacific Ocean and are found off the southern coast of Japan (with the exception of Ogasawara and Ryukyu ), China , Korea , Taiwan, and Vietnam [2] .
In these rays, pectoral fins form a heart-shaped disc. The snout is blunt. The long tail resembles the tail of sharks, it is slightly flattened, there are lateral crests. There are two large and rounded dorsal fins. The tail ends with a tail fin devoid of the lower lobe. The teeth are arranged in dense rows, forming a semblance of a grater that can crush the victim's carapace. Inside the buccal-pharyngeal cavity there are several rows of teeth.
Large spines slightly bent in the form of hooks are located along the ridge. There are no spines in the front of the back. Around the eyes and on the back there is also a pair of spines with a light border. There is an additional lateral row of spines on both sides of the tail, and rostral spines are absent [6] . The skin is covered with tiny scales of the same shape and size [3] . The maximum recorded length is 68 cm. The color of the dorsal surface is even brown, the belly is white [1] .
These stingrays reproduce by egg production. Recent studies of the spinal column have shown that females as a whole are larger compared to males (55.58 cm versus 45.52 cm) and mature more slowly. The maximum life expectancy in females and males is estimated at 12 and 5 years, respectively. The diet consists of crustaceans and small fish. Childbirth occurs from August to November, followed by mating ovulation and fertilization [2] . The diet consists of crustaceans (shrimp), mollusks (orotopods and cephalopods) and small fish [7] .
These stingrays are not of interest for commercial fishing, although their meat is edible. Sometimes they are caught in by- catch in commercial fisheries. The International Union for Conservation of Nature has not yet evaluated the conservation status of this species.
- ↑ 1 2 Compagno, LJV and PRLast. Platyrhinidae: Thornback rays = In: KE Carpenter and VH Niem (eds.) FAO identification guide for fishery purposes. The living marine resources of the Western Central Pacific. - Rome: FAO. - ISBN 9251043027 .
- ↑ 1 2 3 Platyrhina tangi in the FishBase database.
- ↑ 1 2 Iwarsuki, Y. & Miyamoto, K. & Nakaya, K. & Zhang, J. (2011) A review of the genus Platyrhina (Chondrichthys: Platyrhinidae) from the northwestern Pacific, with descriptions of two new species. Zootaxa, 2738: 26-40
- ↑ Christopher Scharpf and Kenneth J. Lazara. Fish Name Etymology Database (Neopr.) . The ETYFish Project . Date of treatment August 29, 2014.
- ↑ Platyrhina tangi (neopr.) . Shark References. Date of treatment August 30, 2014.
- ↑ Deynat PP Characteristics of the dermal covering in Platyrhinidae (Chondrichthyes, Rhinobatiformes) // Biociências. - 2005. - Vol. 13, No. 1 . - P. 75-84.
- ↑ Yamaguchi, A. & Furumiysu, K. & Tanaka, S. & Kume, G. Dietary habits of the fanray Platyrhina tangi (Batoidea: Platyrhinidae) in Ariake Bay // Environmental Biology of Fishes. - Japan, 2012. - Vol. 95, No. (1) . - P. 147-154. - DOI : 10.1007 / s10641-011-9792-4 .
