Joyce, W.G.; Parham, J.F.; Lyson, T.R.; Warnock, R.C.M.; Donoghue, P.C.J.
topology · range · geochronology · methods
Node 1 uses Caribemys oxfordiensis holotype MNHNCu P-3209 for a 155.6 Ma hard minimum and a 251.4 Ma soft maximum; posterior crown ages are model outputs, not specimen dates.
Caribemys holotype MNHNCu P-3209 supports a 155.6 Ma hard minimum for crown Testudines in the cited calibration scheme, whereas the older posterior crown interval is conditional on topology, molecular data, priors and clock model.
claim:event:caribemys-crown-turtle-calibrationThe Pleurodira display route borrows the 155.6 Ma Caribemys-based hard minimum for crown Testudines as a conservative navigation boundary; that calibration is not a Pleurodira origin date, direct ancestor or audited global first appearance.
claim:taxon:pleurodiraThe cited 155.6 Ma Caribemys minimum constrains crown Testudines rather than Pleurodira specifically, so the former Pleurodira range is withheld pending a node-specific fossil calibration.
claim:taxon:pleurodira:range-boundary