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Im not sure about this Ephydra. I was looking in the revision of the genus from Russia by Krivosheina 2021.

From what I can tell it has more than two rows of anterior acrostichals, but i think the genitalia matches E. scholtzi quite well. The two other species of E. known from Norway is riparia and macellaria which I don't think match with the genitalia at least.

Mid Norway 6th April 2023 coast