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Fig. 10. Schematic cross-section of stridulatory file and scraper (based on anatomy
of Arachnoscelis n. sp.) showing hypothetical mechanism of
stridulation in extreme-frequency singers. (A) Different degrees of
deformation the scraper may undergo while pausing behind a tooth in advance of
pulse production. (B) With enough bending, the scraper's shape allows release,
and it springs forward along a series of teeth lodging at the last tooth of
the series (blue asterisk). Pulse-driven oscillations (one per tooth)
indicated with broken lines, contacted teeth with red asterisks. Decay
oscillations indicated by dotted red arrows.
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