Broad Mesozoic matrices distinguish crown-based Mammalia from more inclusive mammaliaform usage, and Jurassic euharamiyidan analyses can move key fossils across that boundary; the atlas Mammalia route therefore does not turn its 225 Ma display ceiling into a crown origin date. This navigation entry is not a phylogeny or a complete taxon dossier.
Represented range164.7–Present Ma
Content packagemammal-origins
PBDBtxn:36651
Evidence boundary
Automated checks cover structure, identifiers, translations and links only; maintainer and external expert review are not complete.
Claim ledger
taxonomy · medium
Broad Mesozoic matrices distinguish crown-based Mammalia from more inclusive mammaliaform usage, and Jurassic euharamiyidan analyses can move key fossils across that boundary; the atlas Mammalia route therefore does not turn its 225 Ma display ceiling into a crown origin date.
Mammalia is displayed at 164.7–0 Ma only as a contested matrix-dependent navigation envelope; it is 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.
claim:taxon:mammalia:source-bounded-range-rc49
Known limits
Stem/crown definitions and divergence estimates vary among morphological and molecular analyses.