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The silvery abdomen colour and translucent yellow spots at the side remind me of Argyra diaphana, but it may lack the hairs on the scutellum shown by that species. It may be another species of Argyra. I should see what someone else says.
My Flickr photos...
well, I'm convinced, unless you think there's another genus it could be
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There is a similar fly on diptera.info, at the moment. It backs up what I said above...you would need a specimen to go further, I think.
yes, by 'pairs of sister species' is of course meant other genus
Since this observation I've found the Swedish key and some enthusiasm for it on Dipterist Forum. That would be the way forward then? It looks a bit daunting.
Ok, so 'sister species' is actually a term from Biology which appears to refer to types of sub-group, and is not a mistranslated Russian idiom as I supposed
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