The Placodermi historical-grade display uses the approximately 436 Ma Huixingshao Formation Xiushanosteus sample as its evidence-linked older anchor; the 358.9 Ma younger edge remains a rounded composite, and neither endpoint is asserted as a global first or last appearance or a direct-ancestor interval. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range436–358.9 Ma
Content packageearly-fishes
PBDBtxn:34249
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 Placodermi historical-grade display uses the approximately 436 Ma Huixingshao Formation Xiushanosteus sample as its evidence-linked older anchor; the 358.9 Ma younger edge remains a rounded composite, and neither endpoint is asserted as a global first or last appearance or a direct-ancestor interval.
claim:taxon:placodermi:fossil-range
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.