Broken-banded Wasp-hoverfly (Chrysotoxum octomaculatum)
Key Details
| Taxonomic Groups: | Invertebrate > insect - true fly (Diptera) > Hoverfly |
| Red List Status: | Endangered (Not Relevant) [EN(nr)] |
| D5 Status: | Included in the baseline Red List Index for England (Wilkins, Wilson & Brown, 2022) |
| Section 41 Status: | (not listed) |
| Taxa Included Synonym: | (none) |
| UKSI Recommended Name: | Chrysotoxum octomaculatum |
| UKSI Recommended Authority: | Curtis, 1837 |
| UKSI Recommended Qualifier: | (none specified) |
| Red List Citation: | Ball & Morris, 2014 |
| Notes on taxonomy/listing: | (none) |
Criteria
| Question 1: | Does species need conservation or recovery in England? |
| Response: | Yes |
| Justification: | Extremely rare and vulnerable with modern records confined to a small number of dry heathland sites in Dorset and Surrey. That is despite much hoverfly recording in these areas and initiatives such as the Cyril Diver Project on the Studland heaths. |
| Question 2: | Does recovery/ conservation depend on species-specific actions? |
| Response: | Yes |
| Justification: | Poor understanding of its specific needs beyond an association with coastal heath and a likely association of its larvae with ant-attended root aphids (though specific ant associations do not seem to be known. What is known is summarised by the Back from the Brink project here: https://naturebftb.co.uk/wp-content/uploads/2020/08/BftB-Broken-banded-Wasp-Hoverfly_Factsheet.pdf |
| Question 3: | At a landscape scale, would the species benefit from untargeted habitat management to increase habitat mosaics, structural diversity, or particular successional stages? |
| Response: | Yes |
| Justification: | It clearly requires large areas of good quality open heathland with varied vegetation structure and a variety of flowers to forage on. |
Species Assessment
| Current step on the Species Recovery Curve (SRC): | 4. Autecology and pressures understood |
| Recovery potential/expectation: | Low - Relict or natural rarity |
| National Monitoring Resource: | Opportunistic - insufficient |
| Species Comments: | Needs targeted surveying/monitoring on all Dorset heaths. |
Key Actions
Key Action 1
Proposed Action: Specific targeted surveying/monitoring in its key area to investigate the extent of populations and whether there are specific habitat needs on Dorset heaths (simultaneously with C. vernale) to feed into a revisions the Red List assessment.
Action targets: 2. Biological status assessment exists
Action type: Status survey/review
Duration: 2 years
Scale of Implementation: ≤ 20 sites
High priority sites: Dorset heaths esp Studland area
Comments:
Key Action 2
Proposed Action: Research into ant hosts - are these specific to species / genera or is habitat equally or more important?
Action targets: 4. Autecology and pressures understood
Action type: Scientific research
Duration: 2 years
Scale of Implementation: ≤ 10 sites
High priority sites: Dorset heaths esp Studland area
Comments: Action 2 field work could be carried out alongside Action 1 and other Chrysotoxum species
Acknowledgment:
Data used on this website are adapted from Threatened species recovery actions 2025 baseline (JP065): Technical report and spreadsheet user guide (Natural England, 2025). Available here.