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It has 4 post dc, and it doesn't look any Egle, so not Anthomyiidae.
It is probably a female Hydrotaea (I can't see any pd on t3, are they broken or absent - some species haven't any pd on t3, like Hydrotaea floccosa). I have just little doubt with Potamia littoralis : the genae seem as high as postpedicel, if they were higher or if the arista were short plumose, it would turn to be this genus/species.