Pseudoscorpions are actually arachnids that resemble scorpions, but lack the scorpion's long tail and sting, using their pincers to capture their prey. Pseudoscorpions can be found under fallen leaves, or beneath earth and rocks. Some 2,000 different pseudoscorpion species are known to exist. There is no difference between pseudoscorpions that lived 25 million years ago and specimens alive today. This lack of any anatomical difference proves that these arachnids did not evolve.