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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.〔Praschag ''et al.'' (2007)〕 ==Habitat== 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.〔Anderson (1875), Praschag ''et al.'' (2007)〕〔 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.〔Asmat (2002), Praschag & Gemel (2002), Praschag ''et al (help is on the way).'' (2007)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Black softshell turtle」の詳細全文を読む スポンサード リンク
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