Synchronicity of diversification events among independent xenarthran lineages. The histograms represent the distributions of 10,000 posterior divergence time estimates sampled during the MCMC analysis of the complete ADRA2B + BRCA1 + VWF (codon positions 1+2+3) placental dataset (5130 sites). A. First split within anteaters (node 9) versus first split within armadillos (node 10). The smaller histogram (top right) shows the posterior distribution of the difference between the ages estimated for these nodes (node 10 – node 9). B. Split between three-toed and two-toed sloths (node 6) versus diversification of tolypeutine armadillos (nodes 5 and 7). C. Split between the two divergent species of long-nosed armadillos (node 3) versus diversification of euphractine armadillos (nodes 1 and 2). Numbering of nodes refers to Table 1 and Figures 1 and 3.