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Aaaah, I now have the explanation! Sarcophagidae was my intuition, but couldn't find how to objectify it!
I didn't know that some structure could imitate the postscutellum, I'll have to be carefull.

A family I know almost nothing about, I'll keep this specimen for a day I'll get to it.
For now, I have to finish all my Tachinidae of the year!

Thanks for the help ;)