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Hi,
I tried to raise Phytomyza aquilegiae (also to answer my question in this this thread myself, as nobody could help me out so far :)).
Was a little bit late in the year already I guess, so from all the leaves I checked I could only find one where nothing yet had hatched. I kept it for some days until I realized a hymenopteran pupa within the leaf, so I had no hopes of getting a fly out...
Eventually I spotted a tiny wasp in the glass where I kept the leaf, but upon opening saw an even smaller second one.

Questions I have:
- which family/families do they belong to (Eulophidae? Trichogrammatidae?)
- did they both develop in flies or could one be a hyperparasite?
- is there a person known studying these kinds of wasps?