Not so scary scorpions

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Molt: to shed the outer layer of the body.

Ultraviolet: (1) light waves at wavelengths less than those visible to humans. Also called UV light. (2) invisible light rays just below the violet end of the spectrum... more

Finding Scorpions at Night

All scorpions will fluoresce under a ultraviolet (UV) light,  also known as a "blacklight". The glow is caused by an unidentified substance in a thin layer in their skin. Newly molted scorpions do not fluoresce right away, but they they will glow after they have aged a while.

Bark Scorpion glows under ultraviolet (UV) Light.

Arizona Bark Scorpion (Centruroides sculpturatus) under a ultraviolet (UV) light.

Credit: Photo by Barb Backes.

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Bibliographic details:

  • Article: Ultraviolet Scorpions
  • Author(s): Christopher Putnam
  • Publisher: Arizona State University School of Life Sciences Ask A Biologist
  • Site name: ASU - Ask A Biologist
  • Date published: December 23, 2009
  • Date accessed: April 13, 2024
  • Link:

APA Style

Christopher Putnam. (2009, December 23). Ultraviolet Scorpions. ASU - Ask A Biologist. Retrieved April 13, 2024 from

American Psychological Association. For more info, see

Chicago Manual of Style

Christopher Putnam. "Ultraviolet Scorpions". ASU - Ask A Biologist. 23 December, 2009.

MLA 2017 Style

Christopher Putnam. "Ultraviolet Scorpions". ASU - Ask A Biologist. 23 Dec 2009. ASU - Ask A Biologist, Web. 13 Apr 2024.

Modern Language Association, 7th Ed. For more info, see
Emporer scorpion

The Emperor scorpion (Pandinus imperator) is a species of scorpion found in Africa. This one is glowing under ultraviolet light.

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