Morphometric analyses. A A two-dimensional PCA biplot illustrates morphological data from the species studied, with variable loadings represented by arrows, where the length and direction indicate the magnitude and contribution to each component, and the data points denote the scores in morphometric space. B KNN classification of three species using scaled and centered data of the two variables contributing the most to group differentiation based on R2 and F-values of the stepwise discriminant analyses.