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Order Pseudoscorpiones - Pseudoscorpions

Scorpion-like Arachnid Double load of hitchhikers Pseudoscorpion Pseudoscorpion 3 Pseudoscorpion Pseudoscorpion with a Springtail! :D Pseudoscorpion - Apochthonius Marsh Pseudoscorpion
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Pseudoscorpiones (Pseudoscorpions)
Other Common Names
false scorpions
Explanation of Names
"Pseudoscorpiones" is from the Latin word-element pseudo, derived from Greek pseudos (ψηυδος) "false" + Latin scorpiones, the nominative singular form of scorpio "scorpion".
Numbers
worldwide: about 3,400 species in 439 genera of 24 families(1)
US: about 420 species in 110 genera of 20 families(2)
Canada: 26 species in 20 genera of 7 families recorded; about as many others likely to occur(3)
Size
body length usually under 3 mm
Identification
small, flat, with pincer-like pedipalps (but no stinging "tail" as in true scorpions)
identification keys provided in(3)(1)
Range
worldwide
Habitat
under bark and stones, in leaf litter, caves, and homes(4)
Food
Most individuals have poison glands in their pincers which they use to subdue small insects.(5)
Remarks
They are not pests and are considered harmless
Even though most individuals have poison glands, the animals are not large enough to bite people(5)
I've observed them running backwards with ease [Troy]
I've seen them attached to beetles, and I've read they do this to disperse (See photo below) [Troy]

I remember them being abundant in the chicken houses I was responsible for while growing up and I assume they must have been feeding on bird lice [Troy]
None are known to be external parasites (ectoparasites) but they can be found in bird and rodent nests where they feed on arthropods in the nests. They are sometimes found on beetles or other large insects where they apparently feed on mites. [Texas A&M U.]