Utah State University Extension
Pseudoscorpions, also known as false scorpions or book scorpions, are arachnids in the order Pseudoscorpionida. There are more than 3,300 different species of pseudoscorpions throughout the world, with the most dense populations found in the tropics and subtropics. They can be found throughout Utah.
Hodgson, Erin W.; Roe, Alan H.; and Lambert, Brooke, "Pseudoscorpions" (2008). All Current Publications. Paper 945.