I found this arthropod climbing the wall of my room in Lapland, Finland.
(the max width is about 0.5 cm)
What is it? Is it dangerous?
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The picture is not great but I'd assume a pseudoscorpion of some sort. Here is one common species found where humans live but I can't be sure about Lapland specifically and doubt ID is possible at the species level from your image: https://en.m.wikipedia.org/wiki/Chelifer_cancroides
If so, I'm not aware of any harm from these directly, but they can be predators of insects that eat rotting wood, which in turn may indicate a problem with moisture in your structure. A single sighting is not something I would worry about unless you have other signs from those sorts of prey themselves.
answered Mar 1 at 18:40
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2$\begingroup$ thank you the image in the wikipedia link you shared matches $\endgroup$ Commented Mar 1 at 19:38
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3$\begingroup$ According to this observations map, pseudoscorpions do live in Lapland, as does C. cancroides specifically. $\endgroup$ Commented Mar 2 at 10:32