Cross-seam Longtail Dicranophragma adjunctum
This was keyed using the Stubbs BENHS book and led quite straighforwardly to this species. The wing was about 6.6mm long. The apical spurs in the tibia were easy to overlook but clear enough when looked for carefully.
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male Cross-seam Longtail Dicranophragma adjunctum showing head from above, thorax from front and wing (including close-up), Wendling Beck Environment Project (Norfolk, UK), 15th May 2024