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Table 8 Characterisation of C. obsoletus and C. scoticus using the loadings of principal components analyses on eight ratios derived from the morphometric parameters

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 Principal component
PCA1 PCA2 PCA3
Larger spermatheca ratio -0.457 -0.057 -0.048
Smaller spermatheca ratio -0.488 -0.533 -0.008
Chitinous plate ratio -0.652 -0.227 0.122
Palpal ratio -0.502 -0.262 0.234
Flagella ratio -0.707 0.425 0.054
Segment ratio -0.564 0.636 0.142
Wing ratio -0.105 0.161 -0.861
Costa ratio 0.450 -0.244 -0.442
  1. PC1, first axis; PC2, second axis; PC3, third axis. Loadings of fair correlation, or above, are highlighted in bold