Table 1.
Summary of estimates for the age of Placentalia and the number of placental lineages crossing the K–Pg boundary with different datasets, clock models and assumptions. Values in italic represent point estimates, while values in brackets represent 95% HPD intervals. All analyses enforced nine topological constraints within Placentalia to match the current consensus phylogeny.
| dataset | morph | morph | TEa | morph | morph | TE | morph | morph | TE | morph | morph | TEb |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| clock model | TK | IGR | IGR | TK | IGR | IGR | TK | IGR | IGR | TK | IGR | IGR |
| node age constraints | root only | root only | root only | root and internal | root and internal | root and internal | root, internal and Placentalia <93.8 Ma | root, internal and Placentalia <93.8 Ma | root, internal and Placentalia <93.8 Ma | root, internal and Placentalia <66 Ma | root, internal and Placentalia <66 Ma | root, internal and Placentalia <66.0 Ma |
| age of Placentalia (Ma) | 136.2 (118.6–151.2) | 163.7 (146.9–181.3) | 164.5 (150.1–180.1) | 121.7 (108.6–134.5) | 141.5 (127.6–158.1) | 137.0 (124.0–151.7) | 92.9 (90.5–93.8) | 93.0 (90.6–93.8) | 92.2 (90.2–93.8) | 66.0 (65.9–66.0) | 65.9 (65.5–66.0) | 65.9 (65.6–66.0) |
| number of placental lineages crossing KPg boundary | 45 (31–50) | 53 (36–56) | 49 (35–52) | 37 (27–46) | 40 (28–46) | 40 (28–46) | 30 (23–37) | 35 (24–46) | 34 (22–46) | 1 | 1 | 1 |