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Thank you very much Weia - :)
I checked the genus Trichmyia at Fauna Europaea (http://fauna.naturkundemuseum-berlin.de/index.php):
• T. carlestolrai
• T. kostovi
• T. malickyi
• T. parvula
• T. urbica (only this one is reported for Denmark).
So I think this could be a further sign of T. urbica.
Greetings Kuv