Table 2.
Morphometric data (mean ± SE) for various sensilla of adult C. nigrescens. N = sample size. Lb-sg1, 2, 3, 4, the first, second, third, and fourth segment of labium; Lm, labrum; Sb1–4, sensilla basiconica I–IV; Sca, sensilla campaniformia; SF, sensory field on the labial tip; and St1–4, sensilla trichodea I–IV.
| Sensilla Type | Distribution | Length (μm) | Basal Diameter (μm) | N |
|---|---|---|---|---|
| St1 | Lm, Lb-sg1, 2, 3, 4 | 107.1 ± 14.1 | 2.8 ± 0.3 | 20 |
| St2 | Lb-sg1, 2, 3, 4 | 39.2 ± 11.2 | 2.5 ± 0.4 | 20 |
| St3 | Lb-sg4 | 22.9 ± 4.5 | 1.8 ± 0.3 | 20 |
| St4 | Lb-sg4 | 33.2 ± 2.8 | 2.4 ± 0.2 | 15 |
| Sb1 | Lb-sg1, 2 | 13.4 ± 3.0 | 1.9 ± 0.2 | 15 |
| Sb2 | Lb-sg2, 4 | 41.2 ± 8.9 | 3.1 ± 0.4 | 15 |
| Sb3 | Lb-sg3 | 8.9 ± 1.20 | 1.9 ± 0.4 | 15 |
| Sb4 | SF | 7.1 ± 1.3 | 2.1 ± 0.2 | 15 |
| Sca | Lb-sg1, 2 | - | 9.8 ± 1.1 | 15 |