Margarya yangtsunghaiensis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Margarya yangtsunghaiensis
Species Authority: Tschang & Tsi, 1949

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A2a; B1ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2009
Date Assessed: 2008-03-28
Assessor(s): Jiang, Y., McIvor, A., Aldridge, D., Di, L., Yueing, L. & Min, W.
Reviewer(s): Smith, K., McIvor, A. & Seddon, M.
Margarya yangtsunghaiensis has not seen since 1949 despite recent surveys in 2006 by Du Lina. The species may already be extinct, but it may be that further surveys may still find some surviving individuals. Currently it is assessed as Critically Endangered as there has been a decline of at least 80%, based on the fact that none have been found where they were previously recorded. Also it has a small possible extent of occurrence since it was found in only one lake with a surface area of 32 km², and there has been a decline in its known range, quality of habitat, and population size.

Geographic Range [top]

Range Description: This species is (or was) endemic to Lake Yangtsunghai (32 km²) in Yunnan Province, China. The species has not been found since 1949.
Possibly extinct:
China (Yunnan)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species has not been recorded since 1949; it may already be extinct.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This snail was recorded from deep areas in the lake.
Systems: Freshwater

Threats [top]

Major Threat(s): The main threat to this species, if it is still extant, is ongoing pollution of the lake. The species is not harvested. When surveyed in 2006, no live specimens were found from the previous site in the lake where the species was known to occur. It was last seen in 1949.

Conservation Actions [top]

Conservation Actions: No conservation measures are in place for this species. More surveys are required to confirm whether the species is still extant in the lake. There also needs to be awareness raising about this species among local people, and pollution levels in the lake need to be reduced.

Citation: Jiang, Y., McIvor, A., Aldridge, D., Di, L., Yueing, L. & Min, W. 2009. Margarya yangtsunghaiensis. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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