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I haven' got it confirmed. I put the question on a swedish coleoptera forum, but no reply there. There were as you say several larvae on each leaf. The name fits (alnus=alni), but there might be other species that looks similar. There aren't many photos depicting the coleoptera larvae to compare with either. As you see on the other thread I have put a link to the german site with a photo of the Agelastica alni larvae.