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Urticating Hair of Tarantula Spider (SEM)
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Urticating Hair of Tarantula Spider (SEM)
Urticating hair. Scanning electron micrographs (SEM) of the urticating hair of the Mexican Red Knee Tarantula (Brachypelma smithi). Some of the new world" tarantulas have two major defence systems, the obvious being venom but also they have special hairs on their opisthosoma or abdomen known as urticating hairs. When in fear of attack, they will rub their hind legs against their abdomen flicking the hairs at the enemy. The tiny hairs or bristles get into the skin and mucous membranes of the attacker and can cause much irritation and even edema which is sometimes fatal. Studies on these special bristles indicate that they cause both mechanical and chemical harm to the membranes and skin. After kicking off the hairs, the tarantula will have a bald patch on its abdomen. The hairs will not grow back but will be replaced when the spider next moults. Magnification x2910 (x720 at 10cm wide)."
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Media ID 9224671
© POWER AND SYRED/SCIENCE PHOTO LIBRARY
Abdomen Arachnid Brachypelma Smithi Bristles Defence Mechanism Edema Hairs Irritation New World Spider Tarantula
EDITORS COMMENTS
This print showcases the intricate details of the urticating hair of a Tarantula Spider, specifically the Mexican Red Knee Tarantula (Brachypelma smithi). These new world tarantulas possess two formidable defense mechanisms: venom and urticating hairs. When threatened, they vigorously rub their hind legs against their abdomen to release these specialized hairs towards their enemy. The microscopic bristles are designed to penetrate the attacker's skin and mucous membranes, causing intense irritation and even edema, which can be fatal in some cases. Scientific studies have revealed that these unique bristles inflict both mechanical and chemical harm on the membranes and skin of potential predators. As a consequence of this defensive strategy, the tarantula ends up with a bald patch on its abdomen after expelling its urticating hairs. However, during its next molt, these lost hairs will be replaced by new ones. Captured using scanning electron microscopy (SEM), this image magnifies the fascinating structure of these defensive hairs at an astonishing x2910 (x720 at 10cm wide). The photograph not only highlights the beauty found within nature but also serves as a reminder of how diverse organisms have evolved remarkable defense systems to ensure their survival in challenging environments.
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