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OK, I have gone to the literature and studied carefully what I can see of the venation of your specimen. And I see the diagonal vein reaches the margin of the wing. I'd wish somebody else can confirm and I see correctly. This and some other small peculiarities makes me think that it could be Hirmoneura. However I have seen pictures of Hirmoneura obscura and this species doesn't look like your fly. That is why I ruled out in the first place.

Really, with only this picture is very difficult to be completely certain of the ID...

EDIT: Well, I am starting to be really convinced this is Hirmoneura obscura. I have re-checked the venation and really fits :) See attachment. Also legs fit better than N. tauscheri as does the darkening in the frontal part of the wings. Body colour looks odd (perhaps because it is a female and i only know the male?) but morphologically fits truly well :) By the way, H. obscura is the only species in Europe.