Principal component of the Xenocriconemella macrodora species complex. Projections of species on the plane of dimensions 1 and 2, 1 and 3, and 2 and 3. Correlation plot between dimensions and qualities of representation of the morphometric characters (“square cosine” (cos2)). Barplot showing the standardized contribution (%) of morphometric variables for the three dimensions retained by the PCA (only dimensions with sum of squares (SS) loadings > 1 were extracted). A reference soil (red) line is also shown on the barplot. This reference line corresponds to the expected value if the contribution were uniform. For a given dimension, any row or column with a contribution above the reference line could be considered important in contributing to the dimension.