TY - JOUR

T1 - Barremian tricolpate pollen from Portugal

T2 - New evidence for the age of eudicot-related angiosperms

AU - Gravendyck, Julia

AU - Krencker, François-Nicolas

AU - Riding, James B.

AU - Coimbra, Rute

AU - Heimhofer, Ulrich

N1 - Publisher Copyright: Copyright © 2025 the Author(s).

PY - 2025/5/27

Y1 - 2025/5/27

N2 - New evidence on the timing of early angiosperm evolution is presented through the discovery of four well-dated tricolpate pollen grains from the Early Cretaceous midlatitudes. Recovered from nearshore marine sediments in the Lusitanian Basin of Portugal, these fossils significantly expand the pre-Aptian tricolpate pollen record and document a greater number of pre-Aptian tricolpate grains in the midlatitudes than previously recognized. The fossil evidence was obtained through the innovative application of advanced microscopy techniques and was precisely dated through biostratigraphy and strontium isotope stratigraphy on material from the same section. These findings extend the first occurrence of tricolpate pollen to the early late Barremian (~123.0 Ma) in Portugal and possibly worldwide. Our findings provide fossil evidence with minimal dating uncertainty, as both the fossils and their age determination come from the same well-constrained sections, eliminating the need for cross-correlation. This establishes the most reliable age for the first occurrence of tricolpate pollen, unequivocally linked to the eudicot clade—an early derived lineage within angiosperms. These fossils serve as a robust calibration point for phylogenetic studies. Additionally, our study emphasizes the importance of methodological advancements in refining the fossil plant record. The newly applied fluorescence screening method when adapted also in future research could further enhance the detection of rare fossils, offering insights into the diversification of angiosperms.

AB - New evidence on the timing of early angiosperm evolution is presented through the discovery of four well-dated tricolpate pollen grains from the Early Cretaceous midlatitudes. Recovered from nearshore marine sediments in the Lusitanian Basin of Portugal, these fossils significantly expand the pre-Aptian tricolpate pollen record and document a greater number of pre-Aptian tricolpate grains in the midlatitudes than previously recognized. The fossil evidence was obtained through the innovative application of advanced microscopy techniques and was precisely dated through biostratigraphy and strontium isotope stratigraphy on material from the same section. These findings extend the first occurrence of tricolpate pollen to the early late Barremian (~123.0 Ma) in Portugal and possibly worldwide. Our findings provide fossil evidence with minimal dating uncertainty, as both the fossils and their age determination come from the same well-constrained sections, eliminating the need for cross-correlation. This establishes the most reliable age for the first occurrence of tricolpate pollen, unequivocally linked to the eudicot clade—an early derived lineage within angiosperms. These fossils serve as a robust calibration point for phylogenetic studies. Additionally, our study emphasizes the importance of methodological advancements in refining the fossil plant record. The newly applied fluorescence screening method when adapted also in future research could further enhance the detection of rare fossils, offering insights into the diversification of angiosperms.

KW - Airyscan confocal superresolution microscopy

KW - Cretaceous

KW - early angiosperms

KW - palynology

KW - strontium isotope stratigraphy

UR - http://www.scopus.com/inward/record.url?scp=105005897756&partnerID=8YFLogxK

U2 - 10.1073/pnas.2421470122

DO - 10.1073/pnas.2421470122

M3 - Article

VL - 122

SP - e2421470122

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

IS - 21

M1 - e2421470122

ER -