Figure 2.

Bayesian phylogenetic tree of extant and extinct Galápagos tortoise taxa. Distinct haplogroups of becki, guntheri and vicina are indicated with numbers and follow figure 1; island of origin for each taxon is shown on the right; an asterisk (*) signifies an extinct taxon or population and arrows highlight the relative phylogenetic placement of the three populations of giant tortoises on Santa Cruz. Bayesian posterior probabilities and maximum likelihood bootstrap proportions (greater than 50%) are indicated above and below the branches, respectively. For illustration purposes, accurate branch lengths leading to out-group taxa are not shown (indicated by dashed line).