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

Figure 17

Types and sizes of the sensilla of the Gelastocoridae: Nerthrinae (Nerthra nepaeformis). (a) On the dorsal surface PES and CUS are numerous and evenly cover the IV segment of the labium. (b) TRS2 (one) is situated ventrally near the tip of the labium. (c) The shapes of CUS and PES, magnified. The socket is clearly visible. (d) PES and CUS are numerous and cover the ventral surface of the II and III segments. (e) CHB are unevenly distributed on the dorsal surface of the III segment, and COS (prioprereceptive sensilla) are situated on the dorsal surface of the IV segment near the base of the III segment. (f) CH2 are numerous and situated dorsally (D) on segment I of the labium, and COS are placed at the base of the edge of segment II. (g) PAS1 (no. 1–11) are distributed over SFL.