Endemic to Dian Chi Lake (Ref. 6376), with a surface area of 292.6 sq. m in the Yunnan Province. It was common before the 1950s and has become rare afterwards that it was not found anymore in the lake since the 1970s. The most likely caused by habitat loss and introduced species, It is most likely extinct but further surveys are needed to confirm its disappearance for it may be possible that a population may still be present in connected resoirvoirs such as in Songhuaba.. Assessed as Critically Endangered in January 2008 with assumed 0-50 number of mature individuals (Ref. 117912). Also Ref. 9417, 35840, 45563.

Status of threat: Endangered (Ref. 45563).