Image: Pseudoscorpion

Pseudoscorpion

Pseudoscorpion, line drawing. Pseudoscorpions or 'false scorpions' belong to the Order Pseudoscorpionida.

Creator:
Andrew Howells
Rights:
© Australian Museum

Notes

What do pseudoscorpions look like?

Size:
  • Less than 10 mm in length.
Body:
  • No constriction between the cephalothorax (front portion containing head) and the abdomen.
  • Abdomen is segmented, cigar- to tear-drop shaped, flattened and appears hard.
Antennae:
  • Absent.
Eyes:
  • Two or four eyes along front margins of cephalothorax, but some species may have no eyes at all.
Mouthparts:
  • For mashing and chopping up prey and slurping liquids.
Wings:
  • Absent.
Limbs:
  • Eight legs.
  • Pedipalps (appendages between first legs and mouthparts) are large with pincers (chela) at their ends.
Abdomen tip:
  • Absent.

Where are pseudoscorpions found?

  • On land in many habitats including deserts.
  • In leaf litter, under bark and rocks.

What do pseudoscorpions do?

  • Pseudoscorpions are usually solitary but some live in groups.
  • When disturbed they run under cover.
  • They have venom that is delivered via glands in their pincers. The venom is used to paralyse prey and is not harmful to humans.
  • All pseudoscorpions are predators feeding on other invertebrates. They use their pincers to clasp prey, inject venom and then liquefy victims with digestive juices.
  • They move with their pincers outstretched in front.
  • Most spin silk that is generally used for home building and protecting pseudoscorpions that are moulting or breeding.
  • Some species move from one region to the next by clinging to larger animals (mostly insects).
  • They are active at night. If active during the day it is generally in dark places.

What looks similar?

  • Scorpions are easily distinguished from pseudoscorpions as they have long tails with stingers and are usually larger than 10 mm.

Last Updated:

Tags pseudoscorpions, arachnids, arthropods, invertebrates, identification, Bugwise,

2 comments

Ondine Evans - 9.01 AM, 03 January 2010

Looks like you are right! It has the right body shape and number of legs plus the small size sounds right too. They were probably thirsty!

CharlieBobMarley - 11.01 PM, 01 January 2010
Just wondering whether this is a pseudoscorpion? Found two on a container used for dogs water. At the moment the two arachinids???- are 1mm in size, and look exactley like proof drawing.

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