Black softshell turtle

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For the black rayed softshell turtle, see Asiatic softshell turtle.
Black softshell turtle
Bostami Turtle.jpg
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Testudines
Suborder: Cryptodira
Family: Trionychidae
Genus: Nilssonia[1][2]
Species: N. nigricans
Binomial name
Nilssonia nigricans[1][2]
(Anderson, 1875)[1][2]
  • Trionyx nigricans Anderson, 1875
  • Amyda nigricans Mertens, Müller & Rust, 1934
  • Aspideretes nigricans Meylan, 1987
  • Trionix nigricans Richard, 1999

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). 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.[4]


The Bayazid Bastami shrine with its pond

Originally native to the lower Brahmaputra River, the only population ever reliably known consists of 150-300 turtles in a manmade pond which is part of the Hazrat Sultan Bayazid Bastami (also transliterated "Bostami" or "Bustami") shrine at Chittagong, where they are dependent on humans for survival. To the locals and worshippers, the black softshell turtle is known as mazari ("Mazar inhabitant"); specimens from this shrine were used in the first scientific description.[5]

The shrine's caretakers – the Mazar Committee – protect the turtle population, but will not allow specimens to be taken anymore, regardless of whether they would be killed or used for reintroduction into the wild. This is due to the animals being considered the descendants of sinners who were miraculously turned into turtles by a saint during the 13th century.[verification needed] Scientific study of the shrine's turtle population can be arranged,[4] however, providing the animals are not harmed.

As of 2002, the IUCN classified the species as Extinct in the Wild.[2] However, it has since been found that in Assam at least one wild population still exists, inhabiting the Jia Bhoroli River which is a northern tributary of the Brahmaputra. Also, a population of these turtles was identified in the Kasopukhuri pond on Nilachal Hill, next to the Kamakhya Temple at Guwahati in Assam.[6]


  1. ^ a b c d Rhodin 2011, p. 000.207
  2. ^ a b c d e IUCN Status report
  3. ^ 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. 
  4. ^ a b Praschag et al. (2007)
  5. ^ Anderson (1875), Praschag et al. (2007)
  6. ^ Asmat (2002), Praschag & Gemel (2002), Praschag et al (help is on the way). (2007)

Further reading[edit]

  • 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)

External links[edit]