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Fig. 11. Effect of removing teeth from the stridulatory file. (A) Sound oscillogram
(blue) and wing position (red) of an intact specimen. (B) Sonogram of the
sound presented in A, along with the instantaneous velocity of wing movement
(blue). Note the gradual and constant increase in velocity during the region
with strong harmonics. (C) Sound and wing movement of the same specimen after
ablation of teeth in three different parts of the file. First gap corresponds
to the removal of 11 teeth between teeth 125 to 135 (gap=
0.29 mm); the
second gap results from absence of 7 teeth between tooth 142 and 148
(gap=0.17 mm) and the last gap from removal of 7 teeth between 184 and
190 (gap=0.21 mm). Note the abrupt changes in wing movement when the
scraper encounters these gaps. The number of sound produced in segments
between the gaps in the oscillogram matches the number of teeth in the intact
regions of the file. (D) Sonogram of the sound shown in C, including the wing
velocity (blue). Wing velocity is more variable than when the file is intact
(B) with abrupt changes in velocity corresponding to gaps in the file. Scale
bars in A and C refer to wing position traces.
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