The Cnidaria root display uses 562–0 Ma as a sampled navigation envelope from the older bound of the 562–557 Ma Auroralumina horizon to living cnidarians; the fossil's crown placement is a morphology-analysis result, not the observed origin of Cnidaria. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range562–Present Ma
Content packagesponges-cnidarians
PBDBtxn:4524
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 Cnidaria root display uses 562–0 Ma as a sampled navigation envelope from the older bound of the 562–557 Ma Auroralumina horizon to living cnidarians; the fossil's crown placement is a morphology-analysis result, not the observed origin of Cnidaria.
claim:taxon:cnidaria:root-range-rc39
Known limits
A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.