A pseudoscorpion, also known as a false scorpion or book scorpion, is an arachnid belonging to the orderPseudoscorpionida, also known as Pseudoscorpiones or Chelonethida.
Pseudoscorpions are generally beneficial to humans since they prey on clothes moth larvae, carpet beetle larvae, booklice, ants, mites, and small flies. They are tiny and inoffensive, and are rarely seen due to their size.
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Source: Ultra Facts