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Hello people,

Portevinia has red antennae. Cheilosia fasciata has dark hairs on the eyes and quite extensive red around the knees. The dark legs, light hair on the eyes, weak spots on the abdomen and habitat all point to Cheilosia semifasciata. Also the quite downward protruding face, although poorly visible from this angle, is an indication
The larvae mine the leaves of Sedum sp., a common garden plant.
This is also from experience as I have seen all the aforementioned species multiple times in the field...

Kind regards,

Ectemnius