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Yesterday, Sabi?anigo, aragon, Spain, pre-Pyrenees, mountain mediterranean climate. Habitat river, quiet water, with many algae and low level, contaminated. Very low level of water. In a stone of the river, and sucking the water of the lime. Size: about 6-7 mm.



Thanks

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Ephydridae?

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Maybe...

The pic is bad but I think that the bright colours of the fly are distinctive... can be known...

Thanks!

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Not one that I've ever seen before
I know it seems an unlikely habitat, but I wonder whether it could be Odiniidae?

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No, these usually have banded legs. I was first thinking of Leucophenga maculata but the had is not enopugh in focus to check the setae, the wing venation does not wuite seem to fit and the habitat is off.

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Lauxaniidae?

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it appears to be an Odiniidae fly! But not sure...

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Two votes for Odiniidae, one for Lauxaniidae and one for Ephydridae... it looks impossible!

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"... legs sometimes banded" (Oosterbroek)

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This is Prosopomyia pallida Loew (Lauxaniidae)!!

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Thanks, Steve. The species was completely unknown to me. Now I at least have the general impression.

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It is what I meaned, this fly looks and act exactly as Cestrotus, which I know from river stones in Thailand

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My answer flied

I said: Thanks, Steve! Four you, nothing is impossible!!!

Thanks also to Nikita, as Thailand i very far I put it as Prosopomyia.