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Dear Cranefly
I have never seen this before and the family doesn't even occur here in The Netherlands. But I have looked at some drawings of Blephariceridae in Tsalolikhin (ed., 1999). key to freshwater invertebrates of Russia, part 4:diptera; plate 39-42; and your specimen looks quit like a species of the genus Agathon as pictured in plate 41:fig 7-11. The rows of small spinules on the head seems diagnostic. I will send you a copy of the Blephar...-part.