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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