BC Conservation Data Centre: Conservation Status Report
Tanypteryx hageni
Black Petaltail
| Scientific Name: | Tanypteryx hageni |
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| English Name: | Black Petaltail |
| Provincial Status Summary | |
| Status: | S2S3 |
| Date Status Assigned: | March 15, 2023 |
| Date Last Reviewed: | March 15, 2023 |
| Reasons: | Species apparently rare in the Coast and Cascade mountains, but probably more common than the 15 occurrences suggest, given the large area of suitable habitat not explored where more sites probable. The threats in most of range include the high potential for increased periods of drought and logging in the sensitive habitat of the species out side of protected areas will be devastating to localized populations. |
| Range | |
| Range Extent: | F = 20,000-200,000 square km |
| Range Extent Estimate (km2): | 50,416 |
| Range Extent Comments: | This species is found along the mainland coast of BC from a single occurrence in the Kitlope area, Whistler and scattered records in the lower mainland to the Skagit Valley. |
| Area of Occupancy (km2): | D = 6-25 |
| Area of Occupancy Estimate (km2): | 68 |
| Area of Occupancy Comments: | This is a minimum as there are stretches of difficult to access areas with suitable habitat between the northern point and southern coastal mainland. |
| Occurrences & Population | |
| Number of Occurrences: | BC = 6 - 80 |
| Comments: | There are 15 known locations at present, however there are stretches of difficult to access areas with suitable habitat between the northern point and southern coastal mainland. |
| Number of Occurrences with Good Viability / Ecological Integrity: | Rank Factor not assessed |
| Number of Occurrences Appropriately Protected & Managed: | C = 4 - 12 |
| Comments: | Cypress Provincial Park and Golden Ears Provincial Park |
| Population Size: | U = Unknown |
| Threats (to population, occurrences, or area affected) | |
| Degree of Threat: | BD = High - low |
| Comments: | This species uses seepage areas and spring fed bogs in wet mountain ranges where the eggs are laid in the soil of bog and the larvae are found in burrows with moss or other emergent vegetation opening above the water and may take two years to develop. This life history makes them very vulnerable to drought conditions brought on by climate change and to logging which disturbs the wetlands and can cause increased sedimentation. |
| Trend (in population, range, area occupied, and/or condition of occurrences) | |
| Short-Term Trend: | U = Unknown |
| Long-Term Trend: | U = Unknown |
| 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: | Ramsay, L. (2023); Cannings, R. and Ramsay, L. (2015) |
| Date: | March 02, 2023 |
| References | |
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Cannings, R.A. 2002b. Introducing the dragonflies of British Columbia and the Yukon. Royal B.C. Mus., Victoria, BC. 96pp.
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GBIF.org. 2023g. GBIF Occurrence Download for Tanypteryx hageni https://doi.org/10.15468/dl.thh22d Accessed February 2023
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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. 2023. Conservation Status Report: Tanypteryx hageni. B.C. Minist. of Environment. Available: https://a100.gov.bc.ca/pub/eswp/ (accessed Jun 17, 2026).