Comparative Analysis and Systematic Mapping of the Labial Sensilla in the Nepomorpha (Heteroptera: Insecta)

Figure 16

Types and sizes of the sensilla of the Gelastocoridae: Gelastocorinae (Gelastocoris oculatus). (a) On the dorsal surface PES are numerous and cover the IV segment of the labium in even rows, and between two rows of pegs there is a row of CUS. (b) CUS and PES are numerous and cover the ventral surface of the IV segment, a few CH1 are situated laterally (L) on the III segment, one pair of CH2 is placed ventrally (V), and a few CH2 are more situated more laterally on the III segment. (c) COS (prioprereceptive sensilla) are situated dorsally on the IV segment near the base of the III segment. (d) TRS2 (three) are situated ventrally near the tip of the labium. (e) CH1, CH2 are less numerous and situated dorsally (D) on the III segment of the labium, and CH3 are numerous and slightly visible. (f) Several FRS are present on the dorsal surface of the II segment, and HLS are very numerous and distributed in bands along the width of segment II. (g) CH2 and HLS are numerous and densely cover the dorsal surface on the labial segment I; COS are situated at the basal edge of the II segment (h) PAS2 (no. 1–13) are on the left SFL, and PIP in not visible.