The Chondrichthyes display begins at the approximately 439 Ma Qianodus tooth-whorl sample as an evidence-linked stem-chondrichthyan anchor and continues to living members at 0 Ma; isolated teeth do not establish a crown-chondrichthyan global first appearance, a complete lineage range or direct ancestry. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range439–Present Ma
Content packagechondrichthyes
PBDBtxn:34422
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 Chondrichthyes display begins at the approximately 439 Ma Qianodus tooth-whorl sample as an evidence-linked stem-chondrichthyan anchor and continues to living members at 0 Ma; isolated teeth do not establish a crown-chondrichthyan global first appearance, a complete lineage range or direct ancestry.
claim:taxon:chondrichthyes:fossil-range
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
The oldest gnathostome teethAndreev, P.S.; Sansom, I.J.; Li, Q.; Zhao, W.; Wang, J.; Wang, C.-C.; Peng, L.; Jia, L.; Qiao, T.; Zhu, M. · 2022 · DOI 10.1038/s41586-022-05166-2