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Trichobothria (singular trichobothrium) are elongate setae ("hairs") present in arachnids, various orders of insects, and myriapods that function in the detection of airborne vibrations and currents.
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Morphology
Unlike the ordinary setae, which are tapered, the trichobothria have the same gauge on all their extent. They fit into the bottom of a broad and deep cup to which connects a membrane with extreme flexibility which adds an extraordinary mobility to them. The least air vibration is able to put them moving and to excite the small group of sensory cells which ensures their innervation.
Distribution
Trichobothria are present in most orders of the Arachnida, except in Solifugae, Ricinulei and Opiliones (Grassé, 1949). Although the distribution of trichobothria on the bodies of arachnids is often used by systematists (especially in Scorpiones and Pseudoscorpiones), few interordinal patterns are apparent (Shultz, 1990).