Table 1. Node age priors employed to estimate echinoid divergence times.
| Minimum Age Constraints | Gamma-Distributed Priors | ||||||
| Node | Uniform Prior | Joint Uniform Prior Mean and 95% Density | Gamma Prior (shape, scale) | Prior 95% Density | Joint Gamma Prior Mean and 95% Density | Origination Rate (p) | Extinction Rate (q) |
| 1(root) | U(260.4, 355) | 320 (273.3, 355) | Gamma(0.9773, 25.83979) | (261.6, 336.7) | 279.6 (260.4, 319.4) | 0.0578 | 0.0449 |
| 4 | U(199.6, 355) | 288.4 (227.8, 345.4) | Gamma(0.9773, 27.39726) | (200.9, 280.5) | 226.2 (199.6, 263.5) | 0.0573 | 0.0449 |
| 10 | U(40.4, 355) | 144 (45.4, 246.5) | Gamma(0.9910, 11.57407) | (40.9, 74.9) | 56.7 (40.4, 83.9) | 0.1023 | 0.0356 |
| 27 | U(171.6, 355) | 233.1 (172.1, 296.2) | Gamma(0.9773, 19.60784) | (172.5, 229.5) | 184.6 (171.6, 206.1) | 0.0756 | 0.0585 |
| 28 | U(150.8, 355) | 190.4 (150.8, 247.7) | Gamma(0.9743, 18.79699) | (151.7, 206.2) | 161.7 (150.8, 178.3) | 0.0754 | 0.066 |
| 34 | U(93.5, 355) | 123.2 (93.5, 173) | Gamma(0.9802, 25.06266) | (94.7, 167.6) | 107 (93.5, 134) | 0.0702 | 0.0534 |
| 35 | U(99.6, 355) | 158.1 (99.6, 228.8) | Gamma(0.9734, 14.81481) | (100.3, 143.2) | 111.6 (99.6, 134.2) | 0.0913 | 0.1024 |
| 37 | U(40.4, 355) | 87.1 (40.4, 153.2) | Gamma(0.9792, 14.70588) | (41.1, 83.9) | 52 (40.4, 74.4) | 0.0719 | 0.1012 |