CDC Logo

BC Conservation Data Centre: Conservation Status Report

Musculium partumeium
Swamp Fingernailclam

Scientific Name: Musculium partumeium
English Name: Swamp Fingernailclam
Provincial Status Summary
Status: S2S4
Date Status Assigned: April 30, 2015
Date Last Reviewed: April 20, 2015
Reasons: There are only 2 locations for this species in the province. Habitat is somewhat limited. Inventory is needed to refine the rank and the 1939 Kootenay Lake collection should be re-examined (Gelling, L. pers. comm. 2015).
Range Extent: AG = <100-2,500,000 square km
Range Extent Comments: There are only 2 locations for this species. One is from Kootenay Lake in 1969 (Lee and Ackerman 1998) and most recently from 2 small lakes on Salt Spring Island (2014) (Klinkenberg 2013).
Occurrences & Population
Number of Occurrences: AC = 1 - 80
Number of Occurrences with Good Viability / Ecological Integrity: Rank Factor not assessed
Percent Area with Good Viability / Ecological Integrity: B = Very small (<5%)
Number of Occurrences Appropriately Protected & Managed: Rank Factor not assessed
Population Size: Rank Factor not assessed
Threats (to population, occurrences, or area affected)
Degree of Threat: Rank Factor not assessed
Trend (in population, range, area occupied, and/or condition of occurrences)
Short-Term Trend: U = Unknown
Comments: Population sizes can be large, suggesting potential to increase (Mackie 2014).
Long-Term Trend: Rank Factor not assessed
Other Factors
Intrinsic Vulnerability: C=Not intrinsically vulnerable
Comments: Lives 1 year or less and produces few young in two to three broods per year. Dispersal mechanisms good with records from maritimes to southern parts of provinces of Manitoba, Saskatchewan and Alberta, and British Columbia, with new records in 2013 (Mackie 2014).
Environmental Specificity: D=Broad. Generalist or community with all key requirements common.
Comments: Most common in ponds and swamps with muddy bottoms and in small lakes and eddies of rivers among organic detritus. Also common in temporary ponds Clarke 1981; Mackie 2014).
Other Rank Considerations:
Information Gaps
Research Needs:
Inventory Needs:
Author: Mackie, G. and L. Gelling
Date: January 03, 2014
Clarke, A.H. 1981a. The freshwater mollusks of Canada. National Museum of Natural Sciences, National Museums of Canada, D. W. Friesen and Sons, Ltd.: Ottawa, Canada. 446 pp.
Frest T.J. 1997. Freshwater molluscs known or likely to occur in southern British Columbia. Unpublished report submitted to the BC Conservation Data Centre, Ministry of Environment, Lands and Parks, Victoria, BC, Canada.
Klinkenberg, Brian (Editor). 2013. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia 
Lee, J. S. and J.D. Ackerman. 1998a. British Columbia freshwater molluscs held at the Canadian Museum of Nature listed by species. Report prepared for the Conservation Data Centre, Ministry of Environment, Victoria, BC, Canada. 95 pp.
Lee, J.S. 2000. Freshwater molluscs of British Columbia: assessments for all known or potential taxa. Unpubl. rep. submitted to the BC Conservation Data Centre, Minist. Envrion., Lands and Parks, Victoria, BC. 107pp.
Lee, J.S. 2000b. Freshwater molluscs. B.C. Minist. Environ., Lands and Parks, Wildl. Branch. 6 pp.


Please visit the website Conservation Status Ranks for information on how the CDC determines conservation status ranks. For global conservation status reports and ranks, please visit the NatureServe website

Suggested Citation:

B.C. Conservation Data Centre. 2014. Conservation Status Report: Musculium partumeium. B.C. Minist. of Environment. Available: (accessed Apr 5, 2020).