Stridulation

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Stridulation is the production of sounds by an insect or other arthropod by rubbing together two parts of its body, referred to as the stridulatory organs. The mechanism is best known in crickets and grasshoppers, but other insects which stridulate include Scolytinae (bark beetles), Cerambycidae (longhorned beetles), Mutillidae ("velvet ants"), the Black imported fire ant (Solenopsis richteri) and larval Lucanidae (stag beetles), Passalidae (Bessbugs), and Geotrupidae (earth-boring dung beetles). Stridulation is also known in some species of millipede (class Diplopoda).

Stridulation in several of these examples is for attracting a mate, or as a form of territorial behaviour, but can also be a warning signal (acoustic aposematism, as in velvet ants).

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