Fig. 4
From: Female genitalia can evolve more rapidly and divergently than male genitalia
Correlated evolution of female and male genitalia. Plot from phylogenetic two-block partial least squares (pPLS) analyses of female (pygidium) and male (aedeagus) genital shape. Shape variation is illustrated using outlines from species with representative scores along the first latent variable obtained from a phylogenetically controlled partial least-squares analysis of size-normalized Fourier coefficients. These axes correspond closely to the major axes of variation from principal components analyses of shape data prior to controlling for phylogeny (Fig. 2, Supplementary Figs. 2 and 3)
