Pseudoscorpion

One millimeter ruler is in the background of this image of a Pseudoscorpion.
Image used with permission of Biol.net

Photo courtesy of Jim Joy, Goodyear, AZ

Pseudoscorpions are arachnids (approximately 1/8th inch long) they have 8 legs and are closely related to mites, ticks and spiders. They seize victims with their visible front claws or pincers, called pedipalps. These large pedipalps have a poison gland (however they are not dangerous to humans) which gives them a strong resemblance to true scorpions. Scorpions, however, are always much larger and have a stinger on the end of their abdomens.

Pseudoscorpions are beneficial predators. Prey includes minute nematode worms, mites, larvae, other arthropods, and small earthworms.

Further Reading

Pseudoscorpions, Ohio State University Extension Fact Sheet
Pictures of a Pseudoscorpion
Pseudoscorpiones, The American Arachnological Society

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