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Thank you very much.
Very interesting!
Neria nigricornis is not known from Denmark. But the island Bornholm, where i photographed the fly is very close to Sweden.
The 3. antennal segment on my fly is yellow, - is i OK? Shouldn´t it be black? You also note the amber color on thorax behind the wings as something unusual.

About the photo of the ovipositor :I´ll try to upload it to iNaturalist - or send it to you.

Kindly regard
Ruth