Bellamya crawshayi 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Architaenioglossa Viviparidae

Scientific Name: Bellamya crawshayi
Species Authority: (Smith, 1893)
Viviparus crawshayi Smith, 1893

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(ii,iii) ver 3.1
Year Published: 2010
Date Assessed: 2008-06-05
Assessor(s): Jørgensen, A.
Reviewer(s): Van Damme, D., Seddon, M.B. (Mollusc Red List Authority) & Pollock, C.M. (IUCN Red List Unit)
Bellamya crawshayi is endemic to Lake Mweru, which is currently drying out. The species is sensitive to changes in salinity and oxygen levels. Extent of occurrence and threats from the drying up of the lake qualifies the species for Endangered.
Previously published Red List assessments:
1996 Endangered (EN)

Geographic Range [top]

Range Description: Bellamya crawshayi is endemic to Lake Mweru (Zambia and DRC) where several collection sites are known. The area of Lake Mweru is 4,850 km² (Brown 1994) but this is declining.
Countries occurrence:
Congo, The Democratic Republic of the; Zambia
Number of Locations: 1
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: No information available regarding population sizes. Currently the population is considered to be stable; it is widespread in the lake.
Current Population Trend: Stable
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: It is known from Lake Mweru, and sand and mud substrate.
Systems: Freshwater

Threats [top]

Major Threat(s): This species is sensitive to increased salinity and lower oxygen levels. The genus is known to have gone extinct in other lakes as a result of changes in salinity and oxygen levels. In Lake Mweru, sedimentation is occurring as a result of natural processes. Lake Mweru is already very shallow (average 3 m), so it may dry out relatively soon (perhaps within the next 50 years). When the lake level reaches 1-2 m, monsoon rains cause extreme mixing of mud and water, resulting in deoxygenation of the lake and the death of species there.

Conservation Actions [top]

Conservation Actions: No conservation measures in place specific for this species. Monitoring of this and other species in Lake Mweru is necessary. Also research and implementation of measures to protect species in the lake.

Citation: Jørgensen, A. 2010. Bellamya crawshayi. The IUCN Red List of Threatened Species 2010: e.T2741A9474452. . Downloaded on 28 November 2015.
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