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Fig. 6. Outer morphology of asymmetric setae. Scanning electron micrographs
(A,B,D,E) or light micrographs (C,F). (A,B) Overview of sensilla arrangement
in the `tuft' region of the lateral flagellum of Panulirus argus.
Each annulus (A) bears two rows of aesthetascs (AE) flanked by two guard setae
(GS). Guard setae are accompanied by companion setae (CS) at their lateral
margins. One asymmetric seta (arrow) is located between the lateral guard seta
and the aesthetascs. (C–F) Structure of asymmetric setae. Asymmetric
setae have a smooth, slender setal shaft with two kinks and a terminal pore.
(C) The proximal kink in the shaft (arrow) occurs at about one third of the
length and has an angle of about 13°. Scale bar, 100 µm. (D) The shaft
of the asymmetric seta (AS) inserts in a narrow socket and protrudes within
the rows of aesthetascs (AE), many of which are intentionally broken off in
this preparation to reveal their extremely thin cuticle. Proximal kink in the
shaft (arrow). (E,F) At the tip of the shaft, a terminal pore is present
(arrowhead), positioned at the base of a shallow cuticular rim. (E) Terminal
pore at higher magnification. Scale bar in inset, 1 µm. (F) Distal kink in
the shaft (double-arrow). Scale bar, 10 µm.
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