The sampled morphological analysis distinguishes Mammaliaformes from narrower crown-based Mammalia and places several early Mesozoic groups around that boundary; membership is definition- and matrix-dependent rather than a continuous ancestor sequence. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range225–Present Ma
Content packagemammal-origins
PBDBtxn:67456
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
topology · medium
The sampled morphological analysis distinguishes Mammaliaformes from narrower crown-based Mammalia and places several early Mesozoic groups around that boundary; membership is definition- and matrix-dependent rather than a continuous ancestor sequence.
claim:taxon:mammaliaformes:topologyfossil-range · medium
Mammaliaformes is displayed at 225–0 Ma only as the review's sampled, definition-dependent navigation envelope, not a crown-Mammalia origin date. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.