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Hi J?rgen,

It looks like Opomyza florum indeed. A very dark one. I've never seen such a dark specimen of O. florum. I would have loved to study this specimen in more detail, but I know you don't collect specimens. I have one seen a female whith a similar dark abdomen which proved to be O. florum. In that specimen the thorax was much more yellowish than in your specimen though. Still I think your identification is correct.

Jan Willem