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I can confirm Triphbleba but confirming renidens is not as straightforward. Though most visible characters are consistent with renidens, some of these also apply to other species. The picture of the genitalia is, at least partly due to the entirely dark colour, not conclusive either. It rather reminds me of T. trinervis and does not seem to fit the illustration in 'Die Fliegen'. I hope you collected the specimen...?