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Table 3 Median divergence time estimates obtained with informative priors and partitioned morphological clocks

From: Sphenodontian phylogeny and the impact of model choice in Bayesian morphological clock estimates of divergence times and evolutionary rates

Constraints Full model Root Sphenodontia Sphenodontinae Eilenodontinae
No constraints   M Rng HPD M Rng HPD M Rng HPD M Rng HPD
FBD+Start+LExct 325.0 87.8 285.5 76.5 189.7 17.9 164.2 18.5
FBD+Start+NoR 290.4 18 262.4 37.9 188.7 14.7 163.3 32.8
SFBD(s)2l+Start+NoR* 289.5 18.4 260.2 38.1 188.6 14.2 163.7 33.1
FBD+Start+LExct+NoR 290.7 18.8 262.5 38.3 188.7 14.8 163.2 32.8
SFBD(s)2l+Start+LExct+NoR 290.4 18.3 261.9 38.3 188.7 14.6 163.7 33.4
Clock rate + topology FBD+NoR 287.8 17.4 261.8 32.9 188.1 12.5 164.6 33.7
FBD+LExct+NoR 287.9 17.4 262.0 32.7 188.2 12.6 164.7 34.1
  1. Results obtained under the FBD and SFBD tree models with a NoSA diversity taxon sampling strategy and the (best fit) autocorrelated relaxed clock model. More informative priors are implemented to reduce deep root attraction. Median values are reported given the very broad and skewed 95% HPD distributions. Values in bold highlight divergence times in stronger agreement with the fossil record (e.g., within the Permian for the root age), which also have narrower 95% HPD ranges. Abbreviations: M median value for node age, Rng HPD range between lower and upper bound values for the 95% HPD, S sampling strategy. *Model combination with the most conservative root age estimate (greatest agreement with the fossil record) without topology or rate constraints