Bayesian phylogenetic relationships of mitochondrial COI in 19 Operational Taxonomic Units (OTUs) of Osedax boneworms. Two OTUs are new to this study (MB16 and MB17). The triangles represent the maximum depth of the presently known sequence diversity in each OTU. Asterisks (*) on nodes and branches represent Bayesian posterior probability (BPP) values ≥0.99. Branches are colored to be consistent with previously published groupings .