Stem-chelicerate evidence

The stem-chelicerate evidence entity is a navigation group linking sampled Mollisonia appendage anatomy and its morphology-matrix placement to related specimen dossiers. It does not name a natural grade, direct ancestor sequence, global chelicerate FAD or complete stem range. This navigation entry is not a phylogeny or a complete taxon dossier.

Represented range519–500.5 Ma

Content packagetrilobites-chelicerates

PBDBNot linked

Evidence boundary

Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.

Claim ledger

topology · medium

claim:taxon:stem-chelicerate-evidence

fossil-range · medium

The 519–500.5 Ma stem-chelicerate evidence route links the Chengjiang Urokodia and Wheeler Megachelicerax samples and does not represent one lineage's temporal duration.

claim:taxon:stem-chelicerate-evidence:fossil-range

Known limits

A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
PBDB external identifier withheld: no-exact-name-in-snapshot.

References

Urokodia sheds light on the origin of chelicerae and book gills of ChelicerataLiu, Y. et al. · 2026 · DOI 10.1038/s41586-026-10713-2
A chelicera-bearing arthropod reveals the Cambrian origin of cheliceratesLerosey-Aubril, R.; Ortega-Hernández, J. · 2026 · DOI 10.1038/s41586-026-10284-2
Open Tree of Life web servicesOpenTreeOfLife Project
The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
A middle Cambrian arthropod with chelicerae and proto-book gillsAria, C.; Caron, J.-B. · 2019 · DOI 10.1038/s41586-019-1525-4

Report an evidence issue ↗