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And another photo, of the dorsal thorax (guess numbers of setae is important). This one seems to have 4 rows of ac before suture, does that mean it could be riparia afterall? Read this too on the forum...

Riparia and macellaria are the two species in genus Ephydra known from Norway it seems.

I think this is riparia, the genitalia match (I've taken another look at previous post on this forum and my specimen).