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Its not a Hymenoptera because it has only one pair of wings.
It looks like a Syrphidae of the Microdon genus, but its not one of those either.
The wing venation betrays it's 'brand'.
It's a Stratiomyidae!
The species looks like Stratiomys singularior, a male. I don't know if there are any similar looking species of Stratiomys on the Iberian peninsula though.

Greets,

Ectemnius