Bayesian estimation of divergence times among lineages of Acanthoscelides obtectus based on cytochrome c oxidase subunit I (COI). Posterior means and the associated 95% highest probability density (in parentheses) for the age of the most recent common ancestor (tMRCA) are given in years. Calibration had the following priors: tMRCA for ‘Brazil+Old World’ (hypothesis 500) was placed at 500 years before the present (BP); tMRCAs of ‘Mesoamerica’ (hypothesis 7000a) and Mitogroup I (hypothesis 7000b) were placed at 7,000 BP; tMRCAs of ‘Andes’ (hypothesis 8000a) and Mitogroup II (hypothesis 8000b) were set to 8,000 BP (see Material and Methods for calibration details).