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The pupa is that of a moth, not a Cheilosia
Is it? Thanks, David. Just shows one must not jump to conclusions!
University of Edinburgh and Biodiversity Observatory (OU)
But of course that doesn't necessarily mean the mines are not Cheilosia mines
Lat/Lng: 56.58835, 16.419305555556
Beijershamn nature reserve, Oland, Sweden