Brocklehurst and colleagues explicitly analyse “pelycosaurian-grade” synapsids as an early, non-crown sampling grade; the atlas therefore retains Pelycosauria only as a historical navigation grade, not a monophyletic ancestor taxon. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range308–260 Ma
Content packagemammal-origins
PBDBtxn:38883
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
taxonomy · medium
Brocklehurst and colleagues explicitly analyse “pelycosaurian-grade” synapsids as an early, non-crown sampling grade; the atlas therefore retains Pelycosauria only as a historical navigation grade, not a monophyletic ancestor taxon.
claim:taxon:pelycosauria:taxonomyfossil-range · medium
Pelycosauria is displayed at 308–260 Ma only as the review's historical pelycosaurian-grade sample, not a monophyletic taxon range. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.