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

Figure 23

Types and sizes of the sensilla of the Naucoridae: Cryphocricinae (Ambrysus occidentalis). (a) MPS are less numerous and spread evenly over the III segment (dorsal view); several CH3 are present on the II segment (dorsal view). (b) CH2 and CH1 cover the dorsal and ventral surfaces of the I segment; COS are situated ventrally on the II segment. (c) TRS1 (four) and TRS2 (one) are situated on the dorsal side (D), in one tuft located distally on the III segment. (d) TRS1 (five) and TRS2 (one) are distributed over the ventral side (V) in one row near the apex of the labium. (e) MPS are less numerous and distributed evenly over the IV segment (dorsal view); PAS2 are distributed on the labial tip (SFR, SFL). (f) One pair of CH3 is situated ventrally near the distal edge of the III and II segments, CH1 are situated oil the edge of the I segment on the ventral side, and COS are located on the II segment on the ventral.