Chelicerae

Chelicerae are short and have a clasping mechanism with a fixed and a movable finger. The pedipalps are longer and have a claw that resembles that of a scorpion. The abdomen has 12 segments but the last two are reduced and inconspicuous. They do not have a long tail like scorpions and they do not sting. Pseudoscorpions are quite small with a body length generally under 3 mm.

Pseudoscorpions live in many different types of habitats, including forests, grasslands, sand dunes, and sea shores. They prefer to live in crevices and similar spaces and can be found in leaf litter, moss, under tree bark and stones, in bird and mammal nests, and in buildings. Many pseudoscorpions favor sites with high humidity, although some species can tolerate dry conditions. Although they are not commonly seen, pseudoscorpions can be quite abundant. Under favorable conditions, hundreds can be found within just one square yard.

Management: Eliminate places where pseudoscorpions live will also help. Dry out damp areas in the house and around the exterior perimeter. Caulk or seal openings or foundation cracks, windows,and around plumbing, gas, or electrical conduits.Use weather stripping around doors and windows.Expanding-foam sealants may be of value in protecting hidden recesses and other areas not readily visible. Completely sealing any structure may be impossible. If needed, collect individuals with a broom and dustpan and discard or simply vacuum any pseudoscorpions found in the home.

CONTROL: pseudoscorpions are found indoors. Physical removal is the only necessary control. If pseudoscorpions are relatively numerous, that indicates that an insect, such as springtails or psocids are also abundant. Control pseudoscorpions by drying out damp areas with fans or dehumidifiers to make the area less inviting for pseudoscorpions and their prey. Because pseudoscorpions are uncommon indoors and do not harm people, insecticides are not necessary or suggested.