Pseudo scorpions are tiny scorpions found in old books and papers
Chelifer cancroides is the species most commonly found in homes, where they are often observed in rooms with dusty books. There the tiny animals (2.5–4.5 mm or 0.10–0.18 in) can find their food like booklice and house dust mites. They enter homes by "riding along" attached to insects (known as phoresy), the insects employed are necessarily larger than the pseudoscorpion, or they are brought in with firewood. @Curionic
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