Fig. 4

Light microscope photos of Semnoderes armiger. a Introvert and mouth cone, lateral view. b Introvert and segment 1, lateral view. c Segments 1–5, lateral view. d Detail of lateroventral and ventrolateral positions on segments 8 and 9. lvac lateroventral acicular spine, lvcu lateroventral cuspidate spine, oos outer oral styles, pa papilla, pl placid, sp spinoscalid, tr trichoscalid. Arrows mark positions of sensory spots