[Syrphidae] Cheilosia with strange things growing on face

[Sander Bot]

Dear all,



Last June I collected a few Cheilosia in the Alps with weird things growing
on their face. Something like a fungus or so. Have a look at a picture of
an unfortunate lady Cheilosia rhynchops affected by it:
https://observation.org/observation/198290575/.



Does anybody have an idea what this is?



Best wishes,



Sander
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