BC Conservation Data Centre: Conservation Status Report
Pisidium subtruncatum
Shortended Peaclam
| Scientific Name: | Pisidium subtruncatum |
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| Scientific Name Synonyms: |
Euglesa subtruncata
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| English Name: | Shortended Peaclam |
| Provincial Status Summary | |
| Status: | S4? |
| Date Status Assigned: | September 18, 2024 |
| Date Last Reviewed: | September 18, 2024 |
| Reasons: | There are very few records of this species; however, it has been found in broad habitat types over a large range in the province. |
| Range | |
| Range Extent: | FG = 20,000-2,500,000 square km |
| Range Extent Comments: | Recorded from mainland south and central BC in lakes, rivers, streams, muskeg pools and ponds (Clarke 1981). |
| Area of Occupancy (km2): | U = Unknown |
| Occurrences & Population | |
| Number of Occurrences: | CD = 21 - 300 |
| Comments: | Only 4 records known within its range (Mackie 2014). There is one record in INaturalist (#188062200, accessed Nov. 11, 2024); however it is not identified as research grade. |
| Number of Occurrences with Good Viability / Ecological Integrity: | Rank Factor not assessed |
| Percent Area with Good Viability / Ecological Integrity: | U = Unknown |
| Number of Occurrences Appropriately Protected & Managed: | Rank Factor not assessed |
| Population Size: | U = Unknown |
| Threats (to population, occurrences, or area affected) | |
| Degree of Threat: | U = Unknown |
| Comments: | not assessed |
| Trend (in population, range, area occupied, and/or condition of occurrences) | |
| Short-Term Trend: | U = Unknown |
| Comments: | Population trends unknown but its widespread distribution suggests stable with populations probably increasing (Mackie 2014). |
| Long-Term Trend: | U = Unknown |
| Other Factors | |
| Intrinsic Vulnerability: | Rank Factor not assessed |
| Comments: | Lives only ~1 year and produces few young. Dispersal mechanisms apparently excellent being present from Quebec to British Columbia and Northwest Territories (Mackie 2014). |
| Environmental Specificity: | D=Broad. Generalist or community with all key requirements common. |
| Comments: | Occurs in ponds, marshes and small and large lakes and rivers, with little apparent preference for substrate types (Mackie 2014). |
| Other Rank Considerations: | |
| Information Gaps | |
| Research Needs: | |
| Inventory Needs: | |
| Stewardship | |
| Protection: | |
| Management: | |
| Version | |
| Author: | Lea Gelling (2024 review); G. Mackie (2015) |
| Date: | September 18, 2024 |
| References | |
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Clarke, A.H. 1981. The freshwater molluscs of Canada. National Museum of Natural Sciences, Ottawa. 446 pp.
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iNaturalist. Website. Available: http://www.inaturalist.org/
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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.
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Mackie, G. 2014. General Status rank assessment of freshwater molluscs of British Columbia. Prepared for Canadian Wildlife Service, Environment Canada. Gatineau, PQ.
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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 http://www.natureserve.org/.
Suggested Citation:
B.C. Conservation Data Centre. 2024. Conservation Status Report: Pisidium subtruncatum. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 7, 2026).