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Thanks for pointing this out, Tony. I suspect the sluggish behaviour is partly a defensive mechanism, and does not necessarily reflect capability. Evedently, they can run when they want/neeed to.

However there cannot be that many species that this could be (there are only about 12 in all in Europe, I believe, and most of these can readily be ruled out in this instance.)

Might I tentatively suggest O. praticola (female)? If not, what else might it be?