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This small fly (c5mm) keyed out to Angioneura cyrtoneurina, but I have no comparative material nor can I find any photos of the species.

Taken beside a spring-fed stream in a marshy valley bottom in the Yorkshire Wolds, UK yesterday.

Parafacialia are bare, as is the prosternum. One strong pair of scutellar bristles and a shorter, crossed apical pair. Frons roughly 3x width of ocellar triangle.

Thanks for any help with confirmation.