Fig. 1.

Phylogenetic tree and divergence times of southern sea otter, giant otter, and ten other carnivoran species. The phylogeny and divergence time estimation was based on 4-fold degenerate sites across 784 1:1 orthologs and was time-calibrated using fossil- and molecular-derived priors. The Malayan pangolin served as the outgroup. Branch lengths represent time before present (Ma). The mean age of each node is shown, with 95% CIs in parentheses and depicted as purple bars around each node. Geological periods are shown above the time axis.