Maximum likelihood tree of several otariid species. Relationships are depicted among the Z. wollebaeki paratype mitogenome (bolded and blue), 13 otariid species (incl. the previously described Z. wollebaeki mitogenome sequence, GenBank accession number AM422173.1), and three phocid outgroup species. The scale indicates genetic distance. Nodes with 100% bootstrap support (1000 replicates) are depicted in green, with the remaining nodes’ respective bootstrap values indicated to the left.