Small-horned Walckenaer (Walckenaeria corniculans)
Key Details
| Taxonomic Groups: | Invertebrate > spider (Araneae) > Spider |
| Red List Status: | Critically Endangered (Not Relevant) [CR(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: | Walckenaeria corniculans |
| UKSI Recommended Authority: | (O.P.-Cambridge, 1875) |
| UKSI Recommended Qualifier: | (none specified) |
| Red List Citation: | Harvey et al., 2017 |
| Notes on taxonomy/listing: | (none) |
Criteria
| Question 1: | Does species need conservation or recovery in England? |
| Response: | Yes |
| Justification: | CR, criteria: B2ab(ii,iv): in major decline, recorded from only 1 of 13 hectads, all in S and E England, since 2000. |
| Question 2: | Does recovery/ conservation depend on species-specific actions? |
| Response: | Yes |
| Justification: | Highly fragmented distribution/extreme rarity despite habitat/s being relatively widespread |
| 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: | No |
| Justification: | This species would not benefit from untargeted management |
Species Assessment
| Current step on the Species Recovery Curve (SRC): | 2. Biological status assessment exists |
| Recovery potential/expectation: | Unknown |
| National Monitoring Resource: | Opportunistic - insufficient |
| Species Comments: | Habitat superficially varied: mostly mature dry heathland in the extreme south and woodland litter elsewhere. Autecology study needed to identify precise requirements but not feasible unless reliable sites are found. |
Key Actions
Key Action 1
Proposed Action: Targeted survey of all recorded, nearby and apparently suitable sites, using standardised methodology to assess current status (and establish baseline for national monitoring programme)
Action targets: 2. Biological status assessment exists
Action type: Status survey/review
Duration: 2 years
Scale of Implementation: ≤ 20 sites
High priority sites:
Comments: Include collation of survey visits with absence data, noting species likely winter activity period
Key Action 2
Proposed Action: Ensure site managers are aware of species past/recent presence and vulnerability on their sites. Update them with Action 1 results and any emerging guidance on locations/management that may inform commissioning of invertebrate survey work (methods likely to detect/damage species, need for retention and examination of spider by-catch when not a survey target)
Action targets: 5. Remedial action identified
Action type: Advice & support
Duration: Unknown
Scale of Implementation: ≤ 5 sites
High priority sites: Thorne & Hatfield Moors
Comments: Assemble mailing list and update site managers at species-appropriate intervals; most easily delivered by BAS/SRS.
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.