ML phylogeny of Mustelidae showing reconstruction of ancestral areas based on the two-state analysis. Pie charts at nodes show proportional likelihoods that the common ancestor was distributed in the Old World (blue) or New World (red). Proportional likelihood values and associated significance levels for ancestral area reconstructions are presented in Additional file 3. Taxa are colored according to their coding states (see legend). * = occurs in both Old and New World.