Differences in phenotype among the three major lineages of P. hispanicus. The discriminant function scores derived from linear combinations of the phenotypic variables [88,89] are shown. Ellipses correspond to the clusters of the three lineages using the 'k-means' clustering method . Each cluster encloses the observations closest to lineage centroid. The three lineages are plotted using different colours: P. hispanicus edwardsianus blue, P. hispanicus hispanicus Central lineage red, P. hispanicus hispanicus Western lineage green.
Fitze et al. BMC Evolutionary Biology 2011 11:347 doi:10.1186/1471-2148-11-347