The age of Placentalia. (a) Phylogeny of 36 mammals (1 monotreme, 2 marsupials and 33 placentals), with divergence times estimated using calibration strategy 1. (b) Times estimated using strategy 2. (c) Time estimates from . (d) Clade ages fixed to the fossil ages according to  (with the ages of intermediate nodes interpolated using the birth–death process by running MCMCTree without using molecular data). The tree topology with species names is given in the electronic supplementary material, figure S1.
Comparisons of time estimates from this study (y-axis) versus those of dos Reis et al.  (x-axis). Dots indicate posterior mean times, and horizontal and vertical bars show the corresponding 95% CIs. The diagonal line is y = x.