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Thank you very much Eric.
Eulophidae looks very good.
Maybe the larvae belong to the genus Euplectrus. The members of this genus are ectoparasites of caterpillars.
https://www.nhm.a...Euplectrus
https://en.wikipe...Euplectrus
The fungus theory might be wrong. Also the larvae can spin communal cocoons around the host. That was my first thought that I gave up again because I couldn't find any adults. But, maybe the tiny wasps managed to escape.

Marion