Setae are found on all the segments of
the flagellum. The first 2 segments are
dominated by setae 2-33 μm long (mean
15 μm) 0.68-2.3 μm width (mean 1.3 μm).
Proximally in S,1e they appear needle-like
(fig 4) and incline close to the surface but
and are completely devoid of setae and
sensilla (fig 3). The surface is rough in the
setae-rich zone and smooth in the sensilla
placodea-rich zone.