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

Figure 20

Types and sizes of the sensilla of the Naucoridae: Laccocorinae ((a)–(d), Laccocoris hoogstraali, (e)–(g), Heleocoris humeralis). (a) PES are numerous and distributed evenly on the IV segment (dorsal view). (b) TRS1 (three) and TRS2 (two) are distributed on the ventral (V) and dorsal (D) sides, and TRS1 (four) and TRS (two) are situated d in one tuft on the distal edge of the III segment. (c) CH3 densely cover the dorsal surface on the II segment; several CH2 are present. (d) PAS2 (no. 1–11) are distributed over SFL and SFR. (e) TRS1 and TRS2 are placed in one tuft on the distal edge of the III segment; PES are distributed evenly on the dorsal surface of the IV segment but are less numerous on the III segment. (f) PES are numerous and distributed evenly on the IV segment (lateral view); TRS2 (two) and TRS1 (four) are distributed ventrally (V) and dorsally (D); TRS1 (seven) and TRS2 (one) are distributed on the distal edge of the III segment. (g) CH3 densely cover the dorsal surface (D) of the II segment; only several CH2 are present.