"A unitary sound normally produced bya single movement of the sound-producing apparatus. It may be monocyclic, as in the osund produced by the wing of some Drosophila species, or polycyclic as in the closing stridulatory wing stroke of crickets." 
- . Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
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