Morphometric changes in two Late Cretaceous calcareous nannofossil lineages support diversification fueled by long-term cooling
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The Core
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Biometric measurements undertaken on two relevant taxa, Cribrosphaerella and Microrhabdulus, make the core of this paper. The results of this paper allowed us to describe two new species of Microrhabdulus and suggest that the peculiar climatic evolution across the Campanian and Maastrichtian triggered a rise in diversity and size of nannofossils following both Cope’s and Bergmann’s rules and its possible effects on the morphometric changes of Cribrosphaerella and Microrhabdulus. In this study, the link between climate variability and diversification has been discussed, and two new species of Microrhabdulus are described.
2021 ◽
Vol 73
(3)
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pp. A030321
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1993 ◽
Vol 30
(10)
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pp. 2214-2223
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