Emperor scorpion

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Emperor scorpion
Female Emperor Scorpion.jpg
CITES Appendix II (CITES[1]
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Arachnida
Order: Scorpiones
Family: Scorpionidae
Genus: Pandinus
Species: P. imperator
Binomial name
Pandinus imperator
(Koch, 1842)
Emperor scorpions fluoresce under UV light.
How to sex a scorpion.

The emperor scorpion, Pandinus imperator, is a species of scorpion native to rainforests and savannas in West Africa. It is one of the largest scorpions in the world and lives for 6–8 years. Its body is black, but like other scorpions it glows pastel green or blue under ultraviolet light. It is a popular species in the pet trade, and is protected by CITES.


An emperor scorpion on sand.

The emperor scorpion (Pandinus imperator) is one of the largest species of scorpion in the world, with adults averaging about 20 centimetres (7.9 in) in length and a weight of 30 g.[2] However, some species of forest scorpions are fairly similar to the emperor scorpion in size, and one scorpion, Heterometrus swammerdami, holds the record for being the world's largest scorpion at 9 inches (23 cm) in length.[3] The large pincers are blackish-red and have a granular texture. The front part of the body, or prosoma, is made up of four sections, each with a pair of legs. Behind the fourth pair of legs are comb-like structures known as pectines, which tend to be longer in males than in females. The tail, known as the metasoma, is long and curves back over the body. It ends in the large receptacle containing the venom glands and is tipped with a sharp, curved stinger. Scorpion stings can be categorized as mild (similar to a bee sting) to severe to humans depending on the species. Most people are not affected by the Emperor Scorpion's sting, though some people may be allergic to scorpion stings in general.[4] Sensory hairs cover the pincers and tail, enabling the emperor scorpion to detect prey through vibrations in the air and ground.[5]

When gravid (pregnant), the body of a female expands to expose the whitish membranes connecting the segments. The emperor scorpion fluoresces greenish-blue under ultra-violet light.[6][7]

They are known for their docile behavior and almost harmless sting; they do not use their sting to defend themselves when they are adults, however, they may use it in their adolescent stages. They prefer to use their pincers to crush and dismember their prey, their exoskeleton is very sclerotic, causing them to have a metallic greenish black color.

They are often confused with a similar genus (heteronomus), and are one of the most famous scorpions.

Habitat and distribution[edit]

The emperor scorpion is an African rainforest species,[8] but also present in savanna. It is found in a number of African countries, including Benin, Burkina Faso, Côte d’Ivoire, Gambia, Ghana, Guinea, Guinea-Bissau, Togo, Liberia, Mali, Nigeria, Senegal and Sierra Leone.[7]

This species inhabits both tropical forest and open savannas. The emperor scorpion burrows beneath the soil and hides beneath rocks and debris,[5] and also often burrows in termite mounds.[9]

Conservation and human impact[edit]

African Emperor scorpion venom contains the toxins imperatoxin[10] and pandinotoxin.

P. imperator is a popular scorpion in the pet trade, which has led to such over-collecting in the wild that it is now a CITES-listed animal.[1]


This article incorporates text from the ARKive fact-file "Emperor scorpion" under the Creative Commons Attribution-ShareAlike 3.0 Unported License and the GFDL.
  1. ^ a b UNEP-WCMC. "Pandinus imperator (Koch, 1841)". UNEP-WCMC Species Database: CITES-Listed Species. Retrieved 11 June 2011. 
  2. ^ http://www.arkive.org/emperor-scorpion/pandinus-imperator/
  3. ^ Manny Rubio (2000). "Commonly Available Scorpions". Scorpions: Everything About Purchase, Care, Feeding, and Housing. Barron's Educational Series. pp. 26–27. ISBN 978-0-7641-1224-9. The emperor scorpion can reach an overall length of more than 8 inches (20 cm). It is erroneously claimed to be the largest living scorpion in the world. However, some species of Forest Scorpions are its equal. [...] Emperor scorpions have the same venom as a bee.The Guinness Book of Records claims a Forest Scorpion native to rural India, Heterometrus swammerdami, to be the largest scorpion in the world (9 inches [23 cm]). 
  4. ^ "Scorpion Emperor Care Sheet" (PDF). Petco. 2004. Retrieved 2012-03-24. 
  5. ^ a b "Emperor Scorpion". The Animal Information Centre. March 2005. 
  6. ^ "Emperor Scorpion". The Big Zoo. March 2005. 
  7. ^ a b Emperor scorpion media at ARKive Accessed October 20, 2011.
  8. ^ Rod Preston-Mafham & Ken Preston-Mafham (1993). The Encyclopedia of Land Invertebrate Behaviour. Cambridge, Massachusetts: MIT Press. ISBN 978-0-262-16137-4. 
  9. ^ "Scorpion Systematics Research Group". American Museum of Natural History. November 2008. Retrieved October 20, 2011. 
  10. ^ Fernando Z. Zamudio, Renaud Conde, Carolina Arévalo, Baltazar Becerril, Brian M. Martin, Hector H. Valdivia & Lourival D. Possani (1997). "The mechanism of inhibition of ryanodine receptor channels by imperatoxin I, a heterodimeric protein from the scorpion Pandinus imperator". Journal of Biological Chemistry 272 (18): 11886–11894. doi:10.1074/jbc.272.18.11886. PMID 9115249. 

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