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Hi Martin - This is Scatella tenuicosta. In Europe only this species is known from greenhouses, except for a few sites in Britain where the Nearctic Scatella obscura has become established. So far I have had no records of obscura from continental Europe and no records of stagnalis from any greenhouses anywhere. I am in the process of writing up this work, but like so many things it takes longer than I'd like! :(