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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

From: Morphometric discrimination of two sympatric sibling species in the Palaearctic region, Culicoides obsoletus Meigen and C. scoticus Downes & Kettle (Diptera: Ceratopogonidae), vectors of bluetongue and Schmallenberg viruses

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
  1. Units are expressed in μm, except for wing measurements, which are in mm