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Therapsida

A family-level occurrence analysis distinguishes Therapsida from the historical pelycosaurian grade and finds therapsids diversifying while several early-synapsid families decline; this sampled pattern does not date the clade’s origin or imply direct descent from any sampled genus. This navigation entry is not a phylogeny or a complete taxon dossier.

Represented range283.3–259.5 Ma
Content packagemammal-origins
PBDBNot linked

Evidence boundary

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

Claim ledger

taxonomy · medium

A family-level occurrence analysis distinguishes Therapsida from the historical pelycosaurian grade and finds therapsids diversifying while several early-synapsid families decline; this sampled pattern does not date the clade’s origin or imply direct descent from any sampled genus.

claim:taxon:therapsida:sampled-record
fossil-range · medium

Therapsida is displayed at 283.3–259.5 Ma only as the sampled diversification interval in that analysis, not the origin, survival or full duration of Therapsida. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.

claim:taxon:therapsida:source-bounded-range-rc49

Known limits

References

  1. The early evolution of synapsids, and the influence of sampling on their fossil recordBrocklehurst, N.; Kammerer, C.F.; Fröbisch, J. · 2013 · DOI 10.1666/12049
  2. International Chronostratigraphic Chart v2026/06Cohen, K.M.; Harper, D.A.T.; Gibbard, P.L.; Car, N. · 2026 · DOI 10.18814/epiiugs/2025/025001
  3. Open Tree of Life web servicesOpenTreeOfLife Project
  4. The Paleobiology Database application programming interfacePeters, S.E.; McClennen, M. · 2016 · DOI 10.1017/pab.2015.39
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