Table 2.
Descriptive statistics, the coefficient of variation (CV) and Mayr’s coefficient of difference (CD) for 15 measurements and eight ratios of morphometric parameters in two Culicoides species (C. obsoletus and C. scoticus). The 758 Culicoides were trapped in the UK, France and Spain
| Parameter | C. obsoletus | C. scoticus | CD | ||
|---|---|---|---|---|---|
| Mean (SD) | CV | Mean (SD) | CV | ||
| Wing length | 1.27 (0.16) | 12.26 | 1.34 (0.15) | 11.32 | 0.22 |
| Wing width | 0.56 (0.26) | 47.02 | 0.58 (0.06) | 11.05 | 0.04 |
| Costa length | 0.80 (0.10) | 12.8 | 0.83 (0.10) | 12.36 | 0.15 |
| Wing ratio | 2.32 (0.15) | 6.35 | 2.33 (0.06) | 2.6 | 0.05 |
| Costa ratio | 1.59 (0.04) | 2.23 | 1.61 (0.04) | 2.38 | 0.35 |
| Third palp length | 51.94 (6.95) | 13.39 | 51.67 (7.08) | 13.7 | 0.02 |
| Third palp width | 21.47 (3.35) | 15.61 | 17.87 (2.92) | 16.32 | 0.57 |
| Palpal ratio | 2.46 (0.39) | 15.68 | 2.96 (0.61) | 20.42 | 0.51 |
| Flagella 10 length | 37.12 (3.61) | 9.72 | 35.89 (3.72) | 10.37 | 0.17 |
| Flagella 11 length | 49.32 (5.32) | 10.78 | 50.33 (5.10) | 10.12 | 0.10 |
| 5 Apical segment length | 298.30 (26.52) | 8.89 | 299.85 (25.36) | 8.46 | 0.03 |
| 8 Basal segment length | 271.94 (23.76) | 8.74 | 259.02 (20.94) | 8.08 | 0.29 |
| Flagella ratio | 1.10 (0.05) | 4.62 | 1.16 (0.07) | 6.24 | 0.50 |
| Segment ratio | 1.33 (0.11) | 8.06 | 1.41 (0.14) | 9.96 | 0.31 |
| Larger spermatheca length | 47.89 (1.74) | 3.63 | 61.64 (2.18) | 3.54 | 3.51 |
| Larger spermatheca width | 33.26 (1.47) | 4.43 | 41.19 (2.48) | 6.03 | 2.00 |
| Smaller spermatheca length | 47.29 (1.31) | 2.77 | 61.03 (1.88) | 3.09 | 4.30 |
| Smaller spermatheca width | 32.83 (1.59) | 4.84 | 40.35 (2.80) | 6.93 | 1.72 |
| Larger spermatheca ratio | 1.44 (0.07) | 4.84 | 1.50 (0.10) | 6.66 | 0.35 |
| Smaller spermatheca ratio | 1.44 (0.07) | 4.87 | 1.52 (0.11) | 7.37 | 0.42 |
| Length between chitinous plates | 11.91 (1.60) | 13.41 | 20.25 (5.84) | 28.85 | 1.12 |
| Width of chitinous plates | 18.31 (2.08) | 11.37 | 20.68 (2.73) | 13.18 | 0.49 |
| Chitinous plate ratio | 0.66 (0.10) | 15.86 | 0.99 (0.31) | 31.23 | 0.81 |
Units are expressed in μm, except for wing measurements, which are in mm