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

Figure 11

Types, sizes, and distribution of the sensilla of the Belostomatinae (Belostoma flumineum). (a) TRS l, TRS2 are placed dorsally (D) near the apex of the labium. (b) TRS1, TRS2 are distributed ventrally (V); CUS, CH2 are distributed sparsely and unevenly all over the surface of the last segment of labium. (c) CUS and PES are placed dorsally; they are numerous and unevenly distributed over segment IV. (d) CH1, CH2, and CH3 sensilla are sparsely and unevenly distributed, ventral view on the I and II segments are one pair of the COS is situated ventrally; on the border between the I and II segments. (e) Lateral view of the I and II segment; sensilla are densely distributed ventrally, on segment I can be seen one group of the CH1 situated dorsally. (f) PAS1 (no. 1–10), PIP (no. 11) are distributed apicaily on the sensory fields: right (SFR) and left (SFL).