|This article relies largely or entirely upon a single source. (April 2014)|
The slit sensilla is a small mechanoreceptory organ in the exoskeleton of spiders which detects strain due to forces experienced by the animal. As the name indicates, a slit sensilla is a small groove in the exoskeleton which deforms under stress, and these deformations are detected by neurons. Slit sensillae may occur singly, in widely spaced groups of varying alignment, or in tightly clustered parallel groups, with the last being called a 'lyriform organ'.