BC Conservation Data Centre: Conservation Status Report
Galba modicella
Rock Fossaria
| Scientific Name: | Galba modicella |
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| Scientific Name Synonyms: |
Fossaria modicella
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| English Name: | Rock Fossaria |
| Provincial Status Summary | |
| Status: | S5? |
| Date Status Assigned: | April 30, 2015 |
| Date Last Reviewed: | March 14, 2025 |
| Reasons: | This species is found in broad habitat types throughout the province; however there are few records, |
| Range | |
| Range Extent: | G = 200,000-2,500,000 square km |
| Range Extent Comments: | Throughout BC including Vancouver Island (Clarke 1981; Ovaska and Sopuck 2002). |
| Occurrences & Population | |
| Number of Occurrences: | CE = 21 to >300 |
| Comments: | The 30 distinct sites where it has been found gives the minima for the range of occurrences. The upper limit is uncertain but Lee (2000c) suggested it was uncommon, having been found at only 9/176 sites in northern BC, an area completely covered by Clarke's (1981) range map (Lepitzki 2014). |
| Number of Occurrences with Good Viability / Ecological Integrity: | Rank Factor not assessed |
| 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: | D = Low |
| Comments: | Likely low threats, as this species occurs over a broad range in BC in lakes, ponds, streams and vernal pools and ditches (Clarke 1981). |
| Trend (in population, range, area occupied, and/or condition of occurrences) | |
| Short-Term Trend: | Rank Factor not assessed |
| Long-Term Trend: | Rank Factor not assessed |
| Other Factors | |
| Intrinsic Vulnerability: | Rank Factor not assessed |
| Environmental Specificity: | Rank Factor not assessed |
| Other Rank Considerations: | |
| Information Gaps | |
| Research Needs: | |
| Inventory Needs: | |
| Stewardship | |
| Protection: | |
| Management: | |
| Version | |
| Author: | Lepitzki, Dwayne A.W. and Lea Gelling |
| Date: | March 14, 2025 |
| 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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Lee, J.S. 2000c. The distribution and ecology of the freshwater molluscs of northern British Columbia. M.Sc Thesis. University of Northern British Columbia, Prince George. 38 pp.
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Lepitzki, D. 2014. General Status rank assessment of freshwater molluscs of British Columbia. Prepared for Canadian Wildlife Service, Environment Canada. Gatineau, PQ.
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Lepitzki, D.A.W. 2013. General status of freshwater gastropods of Canada. Spreadsheet and summary report containing a list of and Canadian and provincial or territorial general status ranks. Prepared for the General Status of Wildlife Species 2015 project. 31 March 2013. Spreadsheet + 614 pp.
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Lepitzki, D.A.W., and B.M. Lepitzki. 2014. Freshwater and terrestrial mollusc searches in British Columbia Provincial Parks from Banff, Alberta to Trail, British Columbia and return, 6-11 October 2014. Unpublished report submitted to BC Ministry of Environment, Vancouver, BC. 10 pp.
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Ovaska, K. and L. Sopuck. 2002. Surveys for terrestrial and freshwater molluscs on DND lands near victoria, Vancouver Island, British Columbia. Report prepared for DND/CFS Natural Resources Management Program, CFB Esquimalt, BC. 27pp. + appendices.
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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. 2025. Conservation Status Report: Galba modicella. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 5, 2026).