The evolution of Eocene planktonic foraminifera Dentoglobigerina
The evolution of Eocene planktonic foraminifera Dentoglobigerina
Dentoglobigerina is a diverse genus of planktonic foraminifera ranging from the Eocene to Recent. However, the ancestry of Dentoglobigerina has been controversial. A growing body of evidence indicates that the genus Dentoglobigerina was spinose in life and evolved from Eocene Subbotina, whilst others have suggested its origins stem from Acarinina. Here we explore whether Subbotina or Acarinina is the ancestor of Dentoglobigerina by examining 35 specimens, evaluating their morphology and their occurrences through the middle to late Eocene, from localities worldwide. We find that Dentoglobigerina evolved ∼4 million years earlier than previously documented, with the species Dentoglobigerina pseudovenezuelana and ‘Dentoglobigerina’ eotripartita recorded in middle Eocene, Zone E9. Morphological convergences between Dentoglobigerina and Subbotina were found with D. galavisi and D. pseudovenezuelana, and between Dentoglobigerina and Acarinina with ‘D.’ eotripartita. Spine holes were observed in D. galavisi and D. pseudovenezuelana, though not uniformly found in all forms. Our findings suggest that there are two distinct lineages: (1) Dentoglobigerina, encompassing the species D. pseudovenezuelana and D. galavisi as a descendant of Subbotina; and (2) ‘Dentoglobigerina’ (including ‘D.’ eotripartita) as a descendant of Acarinina. Our results contribute to a better understanding of Dentoglobigerina biostratigraphy, phylogeny and evolution, and have implications for taxonomy.
Acarinina, Dentoglobigerina, Eocene, International Ocean Discovery Program, Subbotina, phylogeny, planktonic foraminifera
333-376
Fayolle, Florent
e82d7c52-5cfc-43fe-aa7a-93f1af0a9f05
Wade, Bridget S.
882ef710-e0e7-46a1-b382-eb48b1b31a03
2021
Fayolle, Florent
e82d7c52-5cfc-43fe-aa7a-93f1af0a9f05
Wade, Bridget S.
882ef710-e0e7-46a1-b382-eb48b1b31a03
Fayolle, Florent and Wade, Bridget S.
(2021)
The evolution of Eocene planktonic foraminifera Dentoglobigerina.
Journal of Systematic Palaeontology, 19 (5), .
(doi:10.1080/14772019.2021.1904021).
Abstract
Dentoglobigerina is a diverse genus of planktonic foraminifera ranging from the Eocene to Recent. However, the ancestry of Dentoglobigerina has been controversial. A growing body of evidence indicates that the genus Dentoglobigerina was spinose in life and evolved from Eocene Subbotina, whilst others have suggested its origins stem from Acarinina. Here we explore whether Subbotina or Acarinina is the ancestor of Dentoglobigerina by examining 35 specimens, evaluating their morphology and their occurrences through the middle to late Eocene, from localities worldwide. We find that Dentoglobigerina evolved ∼4 million years earlier than previously documented, with the species Dentoglobigerina pseudovenezuelana and ‘Dentoglobigerina’ eotripartita recorded in middle Eocene, Zone E9. Morphological convergences between Dentoglobigerina and Subbotina were found with D. galavisi and D. pseudovenezuelana, and between Dentoglobigerina and Acarinina with ‘D.’ eotripartita. Spine holes were observed in D. galavisi and D. pseudovenezuelana, though not uniformly found in all forms. Our findings suggest that there are two distinct lineages: (1) Dentoglobigerina, encompassing the species D. pseudovenezuelana and D. galavisi as a descendant of Subbotina; and (2) ‘Dentoglobigerina’ (including ‘D.’ eotripartita) as a descendant of Acarinina. Our results contribute to a better understanding of Dentoglobigerina biostratigraphy, phylogeny and evolution, and have implications for taxonomy.
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More information
Accepted/In Press date: 28 January 2021
e-pub ahead of print date: 25 May 2021
Published date: 2021
Additional Information:
Funding Information:
We thank Jim Davy for assistance with scanning electron microscopy and his help during the SEM preparation process; Marcin Latas for help with the z-stacking light microscope; Rehemat Bhatia for ordering and washing Site 763 samples; Shari Hilding-Kronforst for fieldwork assistance; and Paul Pearson for comments on an earlier version of this manuscript. We are also grateful to two anonymous reviewers, whose comments improved the clarity of this manuscript. This research used samples provided by the International Ocean Discovery Program (IODP) and its predecessors. BW was supported by Natural Environment Research Council grant numbers NE/G014817 and NE/P019013/1. Florent Fayolle acknowledges funding from the Geologists’ Association Curry Award.
Funding Information:
We thank Jim Davy for assistance with scanning electron microscopy and his help during the SEM preparation process; Marcin Latas for help with the z-stacking light microscope; Rehemat Bhatia for ordering and washing Site 763 samples; Shari Hilding-Kronforst for fieldwork assistance; and Paul Pearson for comments on an earlier version of this manuscript. We are also grateful to two anonymous reviewers, whose comments improved the clarity of this manuscript. This research used samples provided by the International Ocean Discovery Program (IODP) and its predecessors. BW was supported by Natural Environment Research Council grant numbers NE/G014817 and NE/P019013/1. Florent Fayolle acknowledges funding from the Geologists? Association Curry Award.
Publisher Copyright:
© The Trustees of the Natural History Museum, London 2021. All rights reserved.
Keywords:
Acarinina, Dentoglobigerina, Eocene, International Ocean Discovery Program, Subbotina, phylogeny, planktonic foraminifera
Identifiers
Local EPrints ID: 453405
URI: http://eprints.soton.ac.uk/id/eprint/453405
ISSN: 1477-2019
PURE UUID: 102d1c88-8b34-432b-9739-303e09be1cb2
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Date deposited: 13 Jan 2022 18:23
Last modified: 17 Mar 2024 04:08
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Author:
Bridget S. Wade
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