Figure 2

mtDNA phylogenetic tree obtained by Bayesian inference analysis under a GTR + G + I model. Base frequencies A = 0.3266, C = 0.2140, G = 0.0992, T = 0.3604; rate matrix A-C = 0.5706, A-G = 7.2807, A-T = 0.3662, C-G = 0.8075, C-T = 3.8068, G-T = 1.0000; gamma shape parameter G = 0.8533; proportion of invariant sites = 0.3085. Values above nodes correspond to posterior probability values greater than 0.85. The nodes numbered were used for age dating using a relaxed clock. Phylogenetic relationships among Palmorchestia populations are shown in detail in Figure 3. The arrow indicates the node that was used as calibration point for the estimations of divergence time.