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

Figure 18

Types and sizes of the sensilla of the Aphelocheiridae (Aphelocheirus aestivalis). (a) PES and CUS are numerous and distributed unevenly in rows on the IV segment (dorsal view). (b) TRS2 (one) is situated ventrally near the tip of the labium; PES and CUS are distributed similarly as on the dorsal side. (c) STA and CH3 are in the proximal part of the III segment (dorsal view). (d) STS, CH2, CH3, and COS are situated on the II segment (dorsal view). (e) PES are unevenly distributed on the dorsal surface of the distal part of segment III. (f) CH2 are not numerous and are situated ventrally (V) on segments I and II of the labium. (g) PAS2 (no. 1–12) are distributed over SFL.