The 520–0 Ma Vertebrata route uses a rounded Cambrian navigation ceiling, while Lower Cambrian Chengjiang Myllokunmingia and Haikouichthys material at approximately 518 Ma supplies its direct fossil anchor; neither value dates crown Vertebrata or establishes a global FAD. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range520–Present Ma
Content packageatlas-core
PBDBtxn:67149
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
fossil-range · medium
The 520–0 Ma Vertebrata route uses a rounded Cambrian navigation ceiling, while Lower Cambrian Chengjiang Myllokunmingia and Haikouichthys material at approximately 518 Ma supplies its direct fossil anchor; neither value dates crown Vertebrata or establishes a global FAD.
claim:taxon:vertebrata:root-range
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
Lower Cambrian vertebrates from south ChinaShu, D.-G.; Luo, H.-L.; Conway Morris, S.; Zhang, X.-L.; Hu, S.-X.; Chen, L.; Han, J.; Zhu, M.; Li, Y.; Chen, L.-Z. · 1999 · DOI 10.1038/46965