Pojetaia shell sections document a laminar inner microstructure in one Cambrian bivalve sample; they do not establish the global Bivalvia first appearance or continuous class range.
claim:taxon:bivalviaBivalvia
Pojetaia shell sections document a laminar inner microstructure in one Cambrian bivalve sample; they do not establish the global Bivalvia first appearance or continuous class range. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range514.5–506.5 Ma
Content packagemolluscs-brachiopods
PBDBtxn:16005
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
The cited Pojetaia shell material comes from probably Botomian Ajax Limestone and lowermost Botomian Erkeket Formation units, supporting a Cambrian Stage 4 study-sample envelope of 514.5–506.5 Ma for this Bivalvia route, not a global class FAD, LAD or continuous duration.
claim:taxon:bivalvia:source-bounded-range-rc50Known limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
References
- Shell microstructure of the early bivalve Pojetaia and the independent origin of nacre within the MolluscaVendrasco, M.J.; Checa, A.G.; Kouchinsky, A.V. · 2011 · DOI 10.1111/j.1475-4983.2011.01056.x
- International Chronostratigraphic Chart v2026/06Cohen, K.M.; Harper, D.A.T.; Gibbard, P.L.; Car, N. · 2026 · DOI 10.18814/epiiugs/2025/025001
- Open Tree of Life web servicesOpenTreeOfLife Project
- The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
- Denormalized occurrence and taxon tables of the Paleobiology DatabaseThe Paleobiology Database Community; Kocsis, Á.T. · 2026 · DOI 10.5281/zenodo.21620933