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Fig. 2. Scanning electron micrographs of the stridulatory file. (A) Proximal end of
the file showing variation in inter-tooth distances towards the costal margin;
scale bar, 231 µm. (B) Detail of teeth from the mid portion of the file in
lateral view showing teeth asymmetry and orientation angle; scale bar, 100
µm. (C) Mid portion of the file as seen in dorsal view; scale bar, 231
µm. (D) Entire file showing its curvature and variation in width; scale
bar, 1.36 mm.