Pan-Squamata is a navigation route spanning sampled stem and crown squamates; the Megachirella analysis recovers one fossil on the squamate stem but does not identify a direct ancestor, crown FAD or complete route duration.
claim:taxon:pan-squamataPan-Squamata
Pan-Squamata is a navigation route spanning sampled stem and crown squamates; the Megachirella analysis recovers one fossil on the squamate stem but does not identify a direct ancestor, crown FAD or complete route duration. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range240–Present Ma
Content packageturtles-lepidosaurs
PBDBNot linked
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
Megachirella PZO 628 provides a roughly 240 Ma Middle Triassic Pan-Squamata stem anchor; a 240 Ma–present route is shown without treating the specimen as a direct ancestor or crown-Squamata FAD.
claim:taxon:pan-squamata:range-boundaryKnown limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
- PBDB external identifier withheld: no-exact-name-in-snapshot.
References
- The origin of squamates revealed by a Middle Triassic lizard from the Italian AlpsSimões, T.R.; Caldwell, M.W.; Tałanda, M.; et al. · 2018 · DOI 10.1038/s41586-018-0093-3
- Open Tree of Life web servicesOpenTreeOfLife Project
- The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39