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Systematic taxonomy of middle miocene sphaeroidinellopsis (planktonic foraminifera)

Systematic taxonomy of middle miocene sphaeroidinellopsis (planktonic foraminifera)
Systematic taxonomy of middle miocene sphaeroidinellopsis (planktonic foraminifera)

The taxonomy and phylogeny of the Miocene to Recent genus Sphaeroidinellopsis have been documented in previous studies, but the evolution of this lineage remains unclear. Some authors have debated this genus in the past, choosing a variety of parameters to discriminate the morphospecies. Here we present new scanning electron microscope analyses of specimens from Ocean Drilling Program (ODP) Site 925 (Ceara Rise, western equatorial Atlantic) and ODP Site 959 (Deep Ivorian Basin, eastern equatorial Atlantic). Our study reveals transitional individuals Sphaeroidinellopsis disjuncta–Sphaeroidinellopsis kochi, a speciation event never described previously. These transitional specimens are characterized by extreme morphological features such as elongated and sac-like final chambers, requiring amendments to the current classification and taxonomy of these morphospecies. In this paper, an alternative hypothesis is presented and discussed, to assess these new observations within the evolutionary mosaic of Sphaeroidinellopsis.

Atlantic Ocean, Miocene, Sphaeroidinellopsis, evolution, planktonic foraminifera, taxonomy
1477-2019
953-968
Fabbrini, Alessio
250378cd-2fbf-45d2-a545-da01d2390b7e
Zaminga, Ilaria
90338cbd-b98c-4179-9948-4e3fcaa3278d
Ezard, Thomas
a143a893-07d0-4673-a2dd-cea2cd7e1374
Wade, B.S.
4caf9386-0e3f-479b-a491-6c8dff99dad1
Fabbrini, Alessio
250378cd-2fbf-45d2-a545-da01d2390b7e
Zaminga, Ilaria
90338cbd-b98c-4179-9948-4e3fcaa3278d
Ezard, Thomas
a143a893-07d0-4673-a2dd-cea2cd7e1374
Wade, B.S.
4caf9386-0e3f-479b-a491-6c8dff99dad1

Fabbrini, Alessio, Zaminga, Ilaria, Ezard, Thomas and Wade, B.S. (2021) Systematic taxonomy of middle miocene sphaeroidinellopsis (planktonic foraminifera). Journal of Systematic Palaeontology, 19 (13), 953-968. (doi:10.1080/14772019.2021.1991500).

Record type: Article

Abstract

The taxonomy and phylogeny of the Miocene to Recent genus Sphaeroidinellopsis have been documented in previous studies, but the evolution of this lineage remains unclear. Some authors have debated this genus in the past, choosing a variety of parameters to discriminate the morphospecies. Here we present new scanning electron microscope analyses of specimens from Ocean Drilling Program (ODP) Site 925 (Ceara Rise, western equatorial Atlantic) and ODP Site 959 (Deep Ivorian Basin, eastern equatorial Atlantic). Our study reveals transitional individuals Sphaeroidinellopsis disjuncta–Sphaeroidinellopsis kochi, a speciation event never described previously. These transitional specimens are characterized by extreme morphological features such as elongated and sac-like final chambers, requiring amendments to the current classification and taxonomy of these morphospecies. In this paper, an alternative hypothesis is presented and discussed, to assess these new observations within the evolutionary mosaic of Sphaeroidinellopsis.

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Accepted/In Press date: 25 August 2021
Published date: 13 December 2021
Additional Information: Funding Information: We thank Jim Davy for assistance with SEM and his help during the preparation process. This research used samples provided by the International Ocean Discovery Program (IODP) and its predecessors. AF and BW were supported by the Natural Environment Research Council (grant number NE/P019013/1); THGE was supported by the Natural Environment Research Council (grant number NE/P019269/1). The authors are very grateful to Dr Adriane Lam and the anonymous reviewer for their taxonomic comments and help in improving the manuscript. Funding Information: We thank Jim Davy for assistance with SEM and his help during the preparation process. This research used samples provided by the International Ocean Discovery Program (IODP) and its predecessors. AF and BW were supported by the Natural Environment Research Council (grant number NE/P019013/1); THGE was supported by the Natural Environment Research Council (grant number NE/P019269/1). The authors are very grateful to Dr Adriane Lam and the anonymous reviewer for their taxonomic comments and help in improving the manuscript. Publisher Copyright: © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Keywords: Atlantic Ocean, Miocene, Sphaeroidinellopsis, evolution, planktonic foraminifera, taxonomy

Identifiers

Local EPrints ID: 457542
URI: http://eprints.soton.ac.uk/id/eprint/457542
ISSN: 1477-2019
PURE UUID: 8839eed3-4b5e-41fb-869d-9e7a19d0e0e8
ORCID for Thomas Ezard: ORCID iD orcid.org/0000-0001-8305-6605

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Date deposited: 10 Jun 2022 16:42
Last modified: 22 Jun 2024 04:04

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Contributors

Author: Alessio Fabbrini
Author: Ilaria Zaminga
Author: Thomas Ezard ORCID iD
Author: B.S. Wade

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