Lamprotula tortuosa 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Bivalvia Unionoida Unionidae

Scientific Name: Lamprotula tortuosa (Lea, 1865)
Unio tortuosus Lea, 1865

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c ver 3.1
Year Published: 2011
Date Assessed: 2009-09-30
Assessor(s): Do, V.
Reviewer(s): Van Damme, D., Bogan, A.E., Tran, L.D. & GarcĂ­a, N.
Populations of Lamprotula toutuosa are conservatively inferred to be declining  at a rate of at least 30% (although as much as 2/3 of the populations may have gone already) since the 1950s and 1960s. This species is over-harvested, and there is a rapid decline of the quality of its habitat, particularly because of the degree of pollution within the areas rivers.

Geographic Range [top]

Range Description:This species has been recorded from Taihu Lake and the Grand Canal in Jiangsu, Shuiyangjiang River Anhui's Ningguo, Poyang Lake, Gan Jiang, Fuhe, Xin Jiang and BoYang River in Jiangxi, Liangzi Lake in Hubei, Dongting Lake in Hunan of China. However it may only still be found in the Poyang Lake and Dongting Lake now.
Countries occurrence:
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):UnknownEstimated extent of occurrence (EOO) - km2:128270
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):Unknown
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:Unknown
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This is a slow growing species that takes a very long time to develop. This species is mainly known from Poygan Lake and other records are uncertain. Compared to the distribution given in the literature (Liu 1979 ) (who describes the situation around 1950-60), the species range has been severely reduced. Populations are conservatively inferred to be rapidly declining  at a minimum estimate of 30% (but as much as 2/3 of the populations may have already gone)  (D. Van Damme pers. comm. 2011).
Current Population Trend:Decreasing
Additional data:
Continuing decline of mature individuals:Unknown
Extreme fluctuations:UnknownPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:UnknownAll individuals in one subpopulation:Unknown

Habitat and Ecology [top]

Habitat and Ecology:In lives in lakes and rivers with deep, fastor slow, clear water and silty sediments.
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):15-20

Use and Trade [top]

Use and Trade: It can be used to produce pearls in some places. And it can also serve as the food of human, poultry, livestock and fish. The shell is also used as a kind of traditional Chinese medicine.

Threats [top]

Major Threat(s): Lamprotula species are heavily harvested because of their shell size and thickness. It is also likely that the high levels of pollution entering the rivers in the area is having a severely detrimental affect on this species.

Conservation Actions [top]

Conservation Actions: The conservation actions already in place are unknown. Research on biology and ecology for this species and habitat protection are needed.

Citation: Do, V. 2011. Lamprotula tortuosa. The IUCN Red List of Threatened Species 2011: e.T166288A6195142. . Downloaded on 22 June 2018.
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