Figure 1. A, phylogenetic relationships within the principal nodes for Octodontomys gliroides, based on Bayesian analysis of mtDNA control region haplotypes. Divergence dates of the most recent common ancestor in million years (above the branches), 95% credible intervals (below the branches), and nodes with high posterior probability (below the 95% credible intervals) are shown. The two main lineages are indicated by black and red lines, and the sublineages found in lineage A, referred to in the text as A1 and A2, respectively, are coloured as follow: sublineage A1, blue; sublineage A2, green. B, haplotype network recovered by statistical parsimony analysis. Each circle represents a different haplotype with size proportional to frequencies, with the largest circles representing the most abundant haplotypes. The coloration pattern of each haplotype represents the lineages and sublineages recovered in the phylogenetic analysis. White circles denote the number of mutational steps between haplotypes. For geographical details of sampling populations and haplotype codes, see Table 1.