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Hi Niels-Jan & Xylosoma,

The colour of the legs is highly variable within species of Piophilidae and quite similar between several species. And the thorax is laterally black, not yellow as seems on the photo.
Nevertheless, after examining the specimen, it is Liopiophila varipes. Its still Liopiophila, according to the latest phylogenteic study; Rochefort 2016 (off the top of my head...).

Kind regards,
Ectemnius