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Fig. 4. Scanning electron micrographs of the file and plectrum surfaces. Anterior
is to the right of the page in all images. (A) The dorsal file surface is
covered with microscopic shingles with their leading edges oriented
anteriorly. A groove on the medial edge of the file (medial to bottom of page)
guides a knob on the plectrum such that the plectrum slides anteriorly and
posteriorly in a controlled alignment, similar to a sliding door in its track.
Scale bar, 100 µm. (B) An oblique view of the file shingles shows the
distinct separation of the shingles and the additional ridge running
medio-laterally on most shingles. Scale bar, 5 µm. (C) A dorsal view of
file shingles (scale bar, 10 µm; inset, 2 µm) shows the more prominent
frictional edges of the shingles on the anterior side, analogous to shingles
on the roof of a house. (D) The ventral surface of the plectrum is composed of
soft-tissue plectrum ridges that run parallel to their antero-posterior
movement over the file. Scale bar, 100 µm. (E) The leading edges
(posterior) of the plectrum ridges fuse with the setae on the ventral surface
of the plectrum. Scale bar, 50 µm. (F) The anterior edge of the hemisphere
of plectrum ridges ultimately attaches to the ventral cuticle of the antennal
base. Scale bar, 100 µm.
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