1) Arachnid 2) Arachnoid 3) False scorpion 1) Book scorpion 
A pseudoscorpion, also known as a false scorpion or book scorpion, is an arachnid belonging to the order Pseudoscorpionida, 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 inoffe...
a small arachnid that superficially resembles true scorpions but does not possess a sting.
any of several small arachnids of the order Chelonethida that resemble a tailless scorpion and that feed chiefly on small insects. Also called