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

Figure 28

Types and sizes of the sensilla of the Notonectidae: Notonectinae (Notonecta glauca). (a) The arrangement of several CH2, CH3, and CH1 on the dorsal surface of the II segment; COS is situated near the edge of the I segment. (b) TRS1 (one pair) placed dorsally, near the apex; CH3 are numerous and distributed all over the surface of the IV segment (dorsal view). (c) CH1 and CH3 are situated in the distal part of the III segment. (d) CH1 are numerous and densely cover the ventral side of the II and I segments; CH2 are numerous and situated on the lateral side of the III segment; CH2 and CH3 are numerous and densely spread over the II and I segments (ventral view). (e) TRS1 (six) and TRS2 (three) are placed near the apex; CH3 are situated in two rows (ventral view, IV segment). (f) PAS2 (no. 1–7) and probably PIP (no. 6 or 9) are located on the sensory field (left-side view; SFL).