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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