Figure 6

Strict consensus of minimum length trees derived from parsimony analysis of the morphological data with implied weighting (k = 3) and relationships among extant taxa constrained to fit the ML/Bayesian analysis of all molecular data (Figure 4A). Lineages that connect extant taxa are colored; river dolphin lineages are red, and other branches are blue. Dotted lines represent fossil lineages and lead to extinct taxa/OTUs (†). Divergence times between extant taxa in the tree are according to the molecular clock analysis of McGowen et al. [20]; divergences of extinct taxa/OTUs are based on first and last appearances in the fossil record (thick black bars; see Table 2 and Additional file 2: Table S2). Note that all Oligocene or older cetaceans fell outside of crown Odontoceti and outside of crown Mysticeti. The molecular clock divergences among extant taxa [20] are shown here to contrast with the patterns recorded in the sampling of the fossil record in our study. Cetacean OTUs in bold followed by "- - - -" are associated with paintings to the right.