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Probably Donacia vulgaris, common leaf beetle of Europe; with aquatic larvae. Some 15mm or less in length, bronzy colored.
Here, seen on leaves of Yellow Water-lily growing in waters of a small lake Lamoura - the highest altitude lake in Jura Mountain range, at 1156m. The lake is in the valley of Jura mountain range; and is surrounded by a coniferous forest, and the majority of it is occupied by grassland, while some of the lake shores are peat-bogs. The site of Lamoura Lake has been designated as a Natura 2000 area, in order to protect this fragile peat-bog ecosystem.
An uninvited but welcomed guest on a photos of water-lilies; I noticed this beetle only when I started working on my pics on computer... And thanks to Paul Davis for helping out with the ID...