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Hello Benoit (Martha?)

it is somewht late now. I found this post by fortune just now!

To my knowledge, that larvae is almost clearly a lepidoptera! That estimation is since there are 4 pairs of pseudolegs as can be seen in the second picture!

I am only a layman. But, my guess is Eurrhypara hortulata L.

Perhaps you ask the specialists in the Lepiforum.

Best wishes,

Josef