Fig. 2

Bayesian phylogenetic relationships at loci unlinked to color pattern. Phylogenetic clustering sorts taxa strongly by geographic location. There is a strong phylogenetic break across the Andes, with H. himera clustering with H. erato races from the eastern slopes of the Andes, while H. e. cyrbia clusters with races from the western slopes of the Andes. Heliconius himera clusters within H. erato, rather than diverging prior to the H. erato radiation. Red branches indicate rayed lineages. Nodal values are posterior probabilities of clade support, with bold braches indicating a node with >95 % support. Sample names (ID, hybrid zone, race) are indicated at the terminal nodes, color-coded by race