Black softshell turtle
|Wikispecies has information related to: Nilssonia nigricans|
|Black softshell turtle|
The black softshell turtle or Bostami turtle (Nilssonia nigricans, previously placed in genus Aspideretes) is a species of freshwater turtle found in India (Assam) and Bangladesh (Chittagong and Sylhet). It was long believed to be inbred individuals of the Ganges softshell turtle (A. gangeticus or N. gangeticus) or the Indian peacock softshell turtle (A. hurum or N. hurum), but while it is a close relative of the latter, it is a distinct species.
Originally native to the lower Brahmaputra River, the only population ever reliably known consists of a small number of the species in a man-made pond which is part of the Bayazid Bastami shrine at Chittagong, where they are dependent on humans for survival. To the locals and worshipers, the black softshell turtle is known as mazari ("Mazar inhabitant"); specimens from this shrine were used in the first scientific description.
In a 2014 survey by Poribesh Banchao Andolon, a Bangladeshi private organization it was found that the amount of oxygen dissolved in the pond water was 2.01mg/L, whereas the favorable level is 5mg/L.
In 2012, wildlife biologists of the Center for Advanced Research in Natural Resources and Management found a small population in the wild of Sylhet.
It was found that in Assam one wild population of the species also exists, inhabiting the Jia Bhoroli River which is a northern tributary of the Brahmaputra. Also, another population of these turtles was identified in the Kasopukhuri pond on Nilachal Hill, next to the Kamakhya Temple at Guwahati in Assam.
Extinction in the wild
As of 2002, the IUCN classified the species as Extinct in the Wild. In 2004, 408 turtles were found in the pond of the shrine. According to the shrine committee staffs, more 90 turtles were hatched out in 2007, 74 in 2008, 96 in 2009, 28 in 2010, 45 in 2012, and 40 in 2014 in the pond.
- Rhodin 2011, p. 000.207
- IUCN Status report
- Fritz Uwe; Peter Havaš (2007). "Checklist of Chelonians of the World". Vertebrate Zoology 57 (2): 311. ISSN 18640-5755. Archived from the original (PDF) on 2010-12-17. Retrieved 29 May 2012.
- Praschag et al. (2007)
- Anderson (1875), Praschag et al. (2007)
- Uddin, Minhaj. "Rare Bostami Turtles of Ctg city in peril". The Daily Star. Retrieved 2015-08-17.
- Asmat (2002), Praschag & Gemel (2002), Praschag et al (help is on the way). (2007)
- Anderson, J. (1875): Description of some new Asiatic mammals and Chelonia. Ann. Mag. Nat. Hist. 4(16): 282-285.
- Praschag, P. & Gemel, R. (2002): Identity of the black softshell turtle Aspideretes nigricans (Anderson 1875) with remarks on related species. Faunistische Abhandlungen 23: 87-116.
- Praschag, P.; Hundsdörfer, A.K.; Reza, A.H.M.A. & Fritz, U. (2007): Genetic evidence for wild-living Aspideretes nigricans and a molecular phylogeny of South Asian softshell turtles (Reptilia: Trionychidae: Aspideretes, Nilssonia). Zool. Scripta 36(4): 301–310. doi:10.1111/j.1463-6409.2007.00282.x (HTML abstract)
- Rhodin, Anders G.J.; van Dijk, Peter Paul; Inverson, John B.; Shaffer, H. Bradley; Roger, Bour (2011-12-31). "Turtles of the world, 2011 update: Annotated checklist of taxonomy, synonymy, distribution and conservation status". Chelonian Research Monographs 5. Archived from the original (PDF) on 2012-01-22.