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One millimeter ruler is in the background of this image of a Pseudoscorpion.
Image used with permission of Biol.net
Pseudoscorpions are arachnids (aprox. 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 include minute nematode worms, mites, larvae, other arthropods, and small earthworms.
Further Reading
These links will open a new window and take you to different sites.
- Pseudoscorpions, Ohio State University Extension Fact Sheet
- Pictures of a Pseudoscorpion
- Pseudoscorpiones, The American Arachnological Society
- Picture of a Pseudoscorpion, UFSIA
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Last modified on August 4, 2003.