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Hi Andr?,
very good photos with many details, but not enough = missing genitalia ;-) We can exclude a lot of species and have to decide between atrovirens and vitellinae (colour doesn?t matter). Following the shape of the pronotum it shoud be atrovirens - not the ultra common vitellinae! To be shure, it would be nice to know the host plant. Did you find this specimen on Populus tremula?
Best regards
Frank