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I cannot see the long anal vein in the first shot but I can in another shot I have (got many). So it is Anthomyiidae in the end :):);) Well spotted, Paqui!! ;)

I have checked Eustalomyia and Eustalomyia histrio looks extremely convincing!! More than anything else I have checked.

Let's see if somebody can confirm this. Anyway, thanks a lot to you both, Paqui and Jorge!! :)