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Hi, so this time I'm sure it's a dipteran, but I can't get further. Who can help?

Length 6.5 mm.

Thx.

https://www.flick...9138@N08/?

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Welcome to the forum Rodolfo.
I would say that this is a typical Sepedon spec. (Sciomyzidae). It is an aquatic species easily identified by their typical stigmatal lobes: long ventral lobes and the ventrolaterals with a thinner distal end, clearly separated from the proximal part.

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Thank you very much!