Makararaja chindwinensis
| Makararaja chindwinensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Makararaja | ||||||||||||
| Roberts , 2007 | ||||||||||||
| Scientific name of the species | ||||||||||||
| Makararaja chindwinensis | ||||||||||||
| Roberts, 2007 |
Makararaja chindwinensis is a species of stingray that is found in Southeast Asian Myanmar . The species and the monotypic genus werescientifically described for the first timein 2007 by the American ichthyologist Tyson R. Roberts . The species occurs in the Chindwin , a tributary of the Irrawaddy , to which the specific epithet chindwinensis refers. The generic name is made up of Makara , the name of the crocodile-like mount of the Hindu river gods Gangā and Varuna , and raja , Latin for rays. Within the stingray belongs Makararaja chindwinensis to the subfamily Hypolophinae ( Syn . Pastinachinae) and forms the sister species of the genus Roche pastinachus . The IUCN can not provide any informationabout a potential endangerment of the species, as little is known about the species and too little data is available about the populations. However, fishermen living in the region catch the species quite frequently.
features
The holotype and the only scientifically investigated specimen to date is a fully grown female, whose body disc is 38.5 cm wide and 39 cm long and whose tail is 57.5 cm long. According to statements by local fishermen, the species does not get much larger and the maximum body disc diameter is around 50 cm, the maximum weight around 3 to 4 kg. Makararaja chindwinensis differs from all other stingrays by the almost completely round body disc (diamond-shaped in Pastinachus ) and the tiny scales, thorns and pearl organs on the back, which give the impression that the fish are scaly. The top is gray or light red-brown in color, the belly is whitish. The tail is about 50% longer than the body disc. The tail base is slimmer than that of Pastinachus , but not as slender as that of Himantura or other stingrays. The slim, stiletto-like and very pointed spine is further back than that of Pastinachus . There is a fold of skin on the underside of the tail, but it is lower than that of Pastinachus . The pectoral fins are supported by 105 to 107 pterygophores (111 to 126 in Pastinachus ). The spiral intestine has 16 to 17 turns (mostly 20 in Pastinachus ). Little is known about the way of life of Makararaja chindwinensis .
supporting documents
- ↑ a b c Tyson R. Roberts: Makararaja chindwinensis , a new genus and species of freshwater dasyatidid Pastinachine stingray from upper Myanmar. Natural History Bulletin of the Siam Society v. 54, no.2, 2007, PDF
- ↑ 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
- ↑ Makararaja chindwinensis in the endangered Red List species the IUCN 2010. Posted by: Compagno, Hunting Association, 2009. Accessed November 15 of 2019.
Web links
- Makararaja chindwinensis on Fishbase.org (English)