A revised shell-character classification diagnoses and reorganizes sampled spiriferid brachiopods; it supports the systematic unit but does not establish a global first appearance, extinction boundary or direct ancestor.
claim:taxon:spiriferidaSpiriferida
A revised shell-character classification diagnoses and reorganizes sampled spiriferid brachiopods; it supports the systematic unit but does not establish a global first appearance, extinction boundary or direct ancestor. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range458.2–251.902 Ma
Content packagemolluscs-brachiopods
PBDBtxn:29043
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
Carter et al. state an Upper Ordovician–Upper Permian stratigraphic range for Spiriferida; the atlas displays 458.2–251.902 Ma by converting those named bounds with ICS v2026/06, not as direct dates, continuous occupancy or an ancestor sequence.
claim:taxon:spiriferida:source-bounded-range-rc50Known limits
- A missing branch or fossil occurrence does not imply biological absence. Internal nodes are not calibrated divergence estimates.
- PBDB mapping requires concept review because the pinned lineage is incompatible with the local expected parent Articulata.
References
- A revised classification of the spiriferid brachiopodsCarter, J.L.; Johnson, J.G.; Gourvennec, R.; Hou, H.-F. · 1994 · DOI 10.5962/p.215817
- 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