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Section: Paleontology
Topic: Paleontology

Morphometric changes in two Late Cretaceous calcareous nannofossil lineages support diversification fueled by long-term climate change

Razmjooei, Mohammad Javad1, 2 ; Thibault, Nicolas1  
1 Department of Geosciences and Natural Resource Management, University of Copenhagen – Copenhagen, Denmark
2 Department of Geological Sciences, Stockholm University – Stockholm, Sweden

10.24072/pcjournal.183 - Peer Community Journal, Volume 2 (2022), article no. e64.

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Morphometric changes have been investigated in the two groups of calcareous nannofossils, Cribrosphaerella ehrenbergii and Microrhabdulus undosus across the Campanian to Maastrichtian of the Zagros Basin of Iran. Results reveal a common episode of size increase at c. 76 Ma, with a sudden increase in the size of C. ehrenbergii and with the emergence of a newly defined, larger species Microrhabdulus zagrosensis n.sp. An even larger species emerges at c. 69 Ma within the Microrhabdulus lineage, Microrhabdulus sinuosus n.sp. The timing of these size changes and origination events matches global changes in nannoplankton diversity and/or in diversity of other planktonic organisms and marine invertebrates. Comparison with long-term global climate change supports that these two distinct episodes of morphological change coincide respectively with the late Campanian carbon isotope event and acceleration of cooling and with climatic instability across the mid-Maastrichtian event.

Published online:
DOI: 10.24072/pcjournal.183
Type: Research article
Razmjooei, Mohammad Javad 1, 2; Thibault, Nicolas 1

1 Department of Geosciences and Natural Resource Management, University of Copenhagen – Copenhagen, Denmark
2 Department of Geological Sciences, Stockholm University – Stockholm, Sweden
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights 
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Razmjooei, Mohammad Javad; Thibault, Nicolas. Morphometric changes in two Late Cretaceous calcareous nannofossil lineages support diversification fueled by long-term climate change. Peer Community Journal, Volume 2 (2022), article  no. e64. doi : 10.24072/pcjournal.183. https://peercommunityjournal.org/articles/10.24072/pcjournal.183/

Peer reviewed and recommended by PCI : 10.24072/pci.paleo.100011

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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