Strict consensus of minimum length trees derived from parsimony analysis of the supermatrix. 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 (†). Branch support (BS) is above internodes, and double decay branch support (ddBS) is to the right of nodes that define relationships among extant taxa (cream background). BS and ddBS are expressed in terms of the number of extra steps beyond minimum tree length. BS scores are rounded up to the nearest tenth of a step, and ddBS scores are rounded up to the nearest step. Higher-level groupings are delimited by brackets to the right of the tree.