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Pisidium rotundatum Prime, 1852
Fat Peaclam
Family: Sphaeriidae


© Ian Gardiner     (Photo ID #69478)


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Distribution of Pisidium rotundatum in British Columbia in British Columbia

Species Information

Pisidium rotundatum is widespread in Canada south of the tree line, also occurring in the northern tier of US states and south in the Rocky Mountains to Mexico (Clarke, 1981). It is most common in ponds, bogs, lagoons, floodplains, and large and small lakes with substrates consisting of mud, marly clay, sand or, occasionally, gravel. It also occurs in temporary ponds (Mackie, 2007). It usually takes shelter among dead leaves of trees (Herrington, 1962).

Note Author: Ian Gardiner

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
NativeS4?YellowNot Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Additional Range and Status Information Links

Species References

Clarke, A. H. 1981. The freshwater molluscs of Canada. National Museum of Natural Sciences, National Museums of Canada, Ottawa, Ontario: 446pp.

Herrington, H. B. 1962. A revision of the Sphaeriidae of North America (Mollusca: Pelecypoda). Miscellaneous Publications, Museum of Zoology, University of Michigan, No. 118: 74pp.

Mackie, G. L. 2007. Biology of freshwater corbiculid and sphaeriid clams of North America. Ohio Biological Survey Bulletin New Series. Vol XV No. 3: 436pp.