Fig. 2

Postlarval instar 1 of Pallenopsis villosa. SEM micrographs (a, b, d, f-h) and stereomicroscopic images of Sytox-stained specimens (c, e). a Overview of four specimens still attached to a piece of egg matrix. b Lateral view. Note the cheliphoral exuvia that remains strung on the fibrous attachment gland secretion. c Ventrolateral view. Note the developing podomeres (1–9) in walking leg 1 but also in the externally unarticulated walking leg 2. The arrow points at the minute primordium of walking leg 4. Asterisks mark the growing ganglion anlagen of the VNC. Arrowheads indicate ventral intersegmental folds. d Detail of the anterior body pole, lateral view. The stippled circle highlights the short attachment gland processes on the scape. The arrow points at the posterior protrusion on the proximal article of the palpal larval limb. e Detail of the anterior body pole, anterolateral view. Arrowheads point at the four eye anlagen dorsal to the brain. f Detail of the chelae. Arrowheads indicate the setae at the dorsal base of each chela finger. The arrow indicates the Y-shaped mouth which is surrounded by three cuticular lips. g Detail of the chela finger tips which lack (sub)terminal pores, indicating the absence of chela glands. h Detail of the scape’s distal end. Arrowheads point at the multiple attachment gland processes with emanating fibrous secretion. The arrow highlights one of the two dorsal setae on the scape. Abbreviations: agp – attachment gland process; br – brain; ch – cheliphore; chp – chela palm; ex – chela exuvia; ff – fixed chela finger; mf – moveable chela finger; ovl – ovigeral larval limb; pal – palpal larval limb; pr – proboscis; sc – scape; wl – walking leg