Fig. 6

Postlarval instar 2 of Pallenopsis hodgsoni. SEM micrographs (a, b, f–j) and stereomicroscopic images of Sytox-stained specimens (c–e). a Specimen breaking through the egg matrix. Anterior to the right. b Ventral view. Arrowheads mark the ventral intersegmental folds between the walking leg segments. c Ventral view. Asterisks mark the developing ventral ganglia. The arrowhead points at the slit-shaped proctodeum. d Antero-ventral view. Walking legs 1 and 2 are fully articulated. Underneath the unarticulated cuticle of the elongate walking leg 3 limb bud, all nine podomeres are prefigured. The inset shows a magnification of the ocular tubercle with the anterior eye pair (arrows). The arrowhead points at the slit-shaped proctodeum. e Postero-dorsal view. Note the absence of any intersegmental folds. f Detail of the chelae. Arrowheads mark seta on the chela, the arrowhead points at the dorso-lateral seta at the distal end of the scape. g Detail of the chela finger tips which lack pores, indicating the absence of chela glands. h Detail of distal end of the scape and the chela palm. Lateral view. The arrowhead points at the dorso-lateral seta on the scape. Insets indicate the position of images shown in i and j. i Magnification of the single attachment gland process with emanating fibrous secretion. j Detail of slit organ (right) and a “Gabelborste” organized in two main bundles comprising numerous delicate setulae each. Abbreviations: ch – chela; chp – chela palm; ff – fixed chela finger; mf – moveable chela finger; ot – ocular tubercle; ovl – ovigeral larval limb; pal – palpal larval limb; pr – proboscis; sc – scape; wl – walking leg