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So many thanks Paul (I kind of doubted you might be one who would first react here:), perhaps we should order it via our local library...

There is at least one species in Finland which at least I have doubted to be crenata, having a slightly fork-resembling two-spiked end of male surstyli, but currently the question has arisen whether micropyga could also be present here.

Have you perhaps encountered both of these two in Central Europe?