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Thank you very much for the identification of Trixa caerulescens, Theo. :)

Best regards,
Marion

PS: I have a question. In the Catalogue of Life I found Trixa alpina Meigen, 1824 basing on Systema diptorum from 2011 as a synonym of Trixa caerulescens. In the last version of Fauna Europaea from 2013 it is listed as a valid species. What is the current status?