Table 2. 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).
| Tested groups | Hypotheses | ||
| Geographicregions | 500 | 7000a | 8000a |
| Mesoamerica | 1,552(497–2,765) | 7,000(6,998–7,002) | 51,398(16,865–96,013) |
| Andes | 246 (66–471) | 1,115(349–2,066) | 8,000(7,998–8,002) |
| Brazil+OldWorld | 500 (498–502) | 2,263(814–4,159) | 16,657(4,537–32,419) |
| Mitogroups | 7000b | 8000b | |
| I | 7,000(6,998–7,002) | 49,659(15,246–91,825) | |
| II | 1,107(351–2,038) | 8,000(7,998–8,002) | |
| III | 2,110(685–3,975) | 15,122(3,854–30,375) | |
| IV | 741(176–1,447) | 5,267(964–11,144) | |