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Table 6 Characterisation of C. obsoletus and C. scoticus using the loadings of principal component analyses on 15 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

PC1

PC2

PC3

Larger spermatheca length

-0.914

-0.212

-0.190

Larger spermatheca width

-0.895

-0.158

-0.146

Smaller spermatheca length

-0.913

-0.215

-0.202

Smaller spermatheca width

-0.870

-0.155

-0.133

Length between chitinous plates

-0.767

-0.163

-0.083

Width of chitinous plates

-0.600

0.019

0.056

Third palp length

-0.168

0.600

-0.150

Third palp width

0.476

0.483

-0.012

Flagella 10 length

-0.032

0.812

-0.209

Flagella 11 length

-0.310

0.787

-0.259

5 Apical segment length

-0.248

0.866

-0.252

8 Basal segment length

0.030

0.910

-0.123

Wing length

-0.539

0.414

0.669

Wing width

-0.180

0.148

0.556

Costa length

-0.481

0.424

0.705

  1. PC1, first axis; PC2, second axis; PC3, third axis. Loadings of fair correlation, or above, are highlighted in bold