References / paperA eudicot from the Early Cretaceous of China
Sun, G.; Dilcher, D.L.; Wang, H.; Chen, Z.
Year2011
Source roleprimary-study
DOI / ID10.1038/nature09811
Fitness and scope
range · taxonomy · morphology
Claim ledger
fossil-range · mediumLeefructus mirus from a 125.8–122.6 Ma bed in the Lower Yixian Formation preserves deeply trilobate leaves and an axillary reproductive axis ending in five long, narrow, partly united carpels, supporting an Early Cretaceous eudicot assignment without fixing Ranunculaceae affinity or the global eudicot first appearance.
claim:event:yixian-leefructustaxonomy · mediumLeefructus mirus is diagnosed as a basal eudicot from the Early Cretaceous Yixian Formation, while a separate 83-plastid-gene analysis resolves selected living early eudicot branches; neither result is a literal ancestor sequence.
claim:taxon:eudicotyledones:taxonomybiogeography · highThe fossil locality represented in this profile is the Daxinfangzi bed of the Yixian Formation in northeastern China; one dated locality does not establish a eudicot origin centre or global distribution.
claim:taxon:eudicotyledones:biogeographyecology · lowLeefructus preserves vegetative and reproductive plant material, supporting only a bounded primary-producer context for the sampled fossil; its habitat and any class-wide eudicot ecology remain unresolved.
claim:taxon:eudicotyledones:ecologymorphology · highLeefructus mirus from the Yixian Formation has deeply three-lobed leaves grouped at nodes and an axillary reproductive axis ending in five narrow, partly united carpels. These are features of the described fossil, not a universal eudicot body plan.
claim:taxon:eudicotyledones:morphologyfossil-range · highEudicotyledones is displayed at 125.8–0 Ma only as a radiometrically bounded Leefructus-sample-to-living navigation anthology: the fossil supports basal-eudicot presence but does not establish the exact global FAD, crown divergence or continuous occupancy.
claim:taxon:eudicotyledones:range-boundary-rc50