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Prezado Rui,

Sorry that I checked this website so late, but what you have photographed is clearly a male of Muscidideicus praetextatus, an exclusive European monospecific dolichopodine genus. This species is usually quite uncommon, but where is occurs, it might be found in numbers. It's confined to saltmarshes and the adjacent humid sandy sites.

I am happy to help with any question concerning Palaearctic and New World dolichodids.

Um abraço,
Marc

Dr Marc Pollet