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Thanks Eric,
This is a new family for me.
I read in this document https://home.hccnet.nl/mp.van.veen/therevidae/therevidae.html#Thereva%20unica that it could be Thereva unica (ex bipunctata) or T. oculata. The size I measured would better match the second and I'll look if there are any illustrations available.
Do you know this species?