The Trilobita root display retains a rounded 521–252 Ma sampled envelope: approximately 521 Ma marks the widespread early record, and revised Changhsingian material documents survival into the latest Permian; neither endpoint is an exact global FAD or LAD. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range521–252 Ma
Content packagetrilobites-chelicerates
PBDBtxn:19100
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 Trilobita root display retains a rounded 521–252 Ma sampled envelope: approximately 521 Ma marks the widespread early record, and revised Changhsingian material documents survival into the latest Permian; neither endpoint is an exact global FAD or LAD.
claim:taxon:trilobita:root-range-rc39
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.