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

Figure 10

Types, sizes and distribution of the sensilla of the Ranatrinae (Ranatra chinensis). (a) PDS1, PDS2, CH1, and CH2 are irregularly distributed on the segment II, III, and IV, dorsal view. (b) TRS1 are placed dorsally (D) near the apex of the labium (fourth segment). (c) TRS1, TRS2 distributed laterally (L), and ventrally (V); CH1 and CH2 are distributed all over the surface of the last segment of the labium. (d) PDS1, PDS2 evenly distributed, dorsal view of the II and III segment. (e) Ventral view of the I, II, and III segments, sensilla are not very numerous; they seem more numerous on the IV labial segment. (f) Shapes and sizes of the PDS1 and PDS2. (g) PASI (no 1–10) distributed apically, PIP is invisible.