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Thank you very much for ID, Truls Lerdahl.
With the species name I looked in the Platypezidae gallery. There I found a second species of the same genus - Polyporivora picta which has a black scutellum like my fly. The Polyporivora ornata in the gallery has a white one. Could the fly be a Polyporivora picta? Is the colour of the scutellum characteristic for the species?

Marion