Spine-like structures in Paleogene muricate planktonic foraminifera

Muricate planktonic foraminifera comprise an extinct clade that was diverse and abundant in the Paleogene oceans and are widely used in palaeoclimate research as geochemical proxy carriers for the upper oceans. Their characteristic wall texture has surface projections called "muricae" form...

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Published in:Journal of Micropalaeontology
Main Authors: Pearson, Paul N., John, Eleanor, Wade, Bridget S., D'HAENENS, Simon, Lear, Caroline H.
Format: Article in Journal/Newspaper
Language:English
Published: COPERNICUS GESELLSCHAFT MBH 2022
Subjects:
Online Access:http://hdl.handle.net/1942/38039
https://doi.org/10.5194/jm-41-107-2022
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spelling ftunivhasselt:oai:documentserver.uhasselt.be:1942/38039 2023-05-15T18:00:33+02:00 Spine-like structures in Paleogene muricate planktonic foraminifera Pearson, Paul N. John, Eleanor Wade, Bridget S. D'HAENENS, Simon Lear, Caroline H. Pearson, Paul N. John, Eleanor Wade, Bridget S. D'HAENENS, Simon Lear, Caroline H. 2022-08-17T11:03:52Z application/pdf http://hdl.handle.net/1942/38039 https://doi.org/10.5194/jm-41-107-2022 en eng COPERNICUS GESELLSCHAFT MBH Journal of micropalaeontology, 41 (2) , p. 107 -127 http://hdl.handle.net/1942/38039 127 2 107 41 doi:10.5194/jm-41-107-2022 000834136600001 Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License. info:eu-repo/semantics/openAccess CC-BY info:eu-repo/semantics/article 2022 ftunivhasselt https://doi.org/10.5194/jm-41-107-2022 2022-09-14T22:20:41Z Muricate planktonic foraminifera comprise an extinct clade that was diverse and abundant in the Paleogene oceans and are widely used in palaeoclimate research as geochemical proxy carriers for the upper oceans. Their characteristic wall texture has surface projections called "muricae" formed by upward deflection and mounding of successive layers of the test wall. The group is generally considered to have lacked "true spines": that is, acicular calcite crystals embedded in and projecting from the test surface such as occur in many modern and some Paleogene groups. Here we present evidence from polished sections, surface wall scanning electron microscope images and test dissections, showing that radially orientated crystalline spine-like structures occur in the centre of muricae in various species of Acarinina and Morozovella and projected from the test wall in life. Their morphology and placement in the wall suggest that they evolved independently of true spines. Nevertheless, they may have served a similar range of functions as spines in modern species, including aiding buoyancy and predation and especially harbouring algal photosymbionts, the function for which we suggest they probably first evolved. Our observations strengthen the analogy between Paleogene mixed-layer-dwelling planktonic foraminifera and their modern spinose counterparts. This research has been supported by the Natural Environment Research Council (grant nos. NE/P019102/1, GR3/12618, NE/X509345/1, and NE/B503225/1) Funding was provided by NERC grant NE/P019102/1 to Caroline H. Lear and Paul N. Pearson as part of the SWEET (Super-Warm Early Eocene Temperatures and climate) consortium (https://www.deepmip.org/sweet/, last access: 22 July 2022). We are grateful to Chris Poole for Fig. 3b and c. We thank Dan Lunt (University of Bristol) for coordinating that project and funding the artwork in Fig. 12. The Belgian American Educational Foundation and the Fulbright Commission of Belgium and Luxemburg provided support to Simon D’haenens. Tanzanian ... Article in Journal/Newspaper Planktonic foraminifera Document Server@UHasselt (Hasselt University) Journal of Micropalaeontology 41 2 107 127
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collection Document Server@UHasselt (Hasselt University)
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language English
description Muricate planktonic foraminifera comprise an extinct clade that was diverse and abundant in the Paleogene oceans and are widely used in palaeoclimate research as geochemical proxy carriers for the upper oceans. Their characteristic wall texture has surface projections called "muricae" formed by upward deflection and mounding of successive layers of the test wall. The group is generally considered to have lacked "true spines": that is, acicular calcite crystals embedded in and projecting from the test surface such as occur in many modern and some Paleogene groups. Here we present evidence from polished sections, surface wall scanning electron microscope images and test dissections, showing that radially orientated crystalline spine-like structures occur in the centre of muricae in various species of Acarinina and Morozovella and projected from the test wall in life. Their morphology and placement in the wall suggest that they evolved independently of true spines. Nevertheless, they may have served a similar range of functions as spines in modern species, including aiding buoyancy and predation and especially harbouring algal photosymbionts, the function for which we suggest they probably first evolved. Our observations strengthen the analogy between Paleogene mixed-layer-dwelling planktonic foraminifera and their modern spinose counterparts. This research has been supported by the Natural Environment Research Council (grant nos. NE/P019102/1, GR3/12618, NE/X509345/1, and NE/B503225/1) Funding was provided by NERC grant NE/P019102/1 to Caroline H. Lear and Paul N. Pearson as part of the SWEET (Super-Warm Early Eocene Temperatures and climate) consortium (https://www.deepmip.org/sweet/, last access: 22 July 2022). We are grateful to Chris Poole for Fig. 3b and c. We thank Dan Lunt (University of Bristol) for coordinating that project and funding the artwork in Fig. 12. The Belgian American Educational Foundation and the Fulbright Commission of Belgium and Luxemburg provided support to Simon D’haenens. Tanzanian ...
author2 Pearson, Paul N.
John, Eleanor
Wade, Bridget S.
D'HAENENS, Simon
Lear, Caroline H.
format Article in Journal/Newspaper
author Pearson, Paul N.
John, Eleanor
Wade, Bridget S.
D'HAENENS, Simon
Lear, Caroline H.
spellingShingle Pearson, Paul N.
John, Eleanor
Wade, Bridget S.
D'HAENENS, Simon
Lear, Caroline H.
Spine-like structures in Paleogene muricate planktonic foraminifera
author_facet Pearson, Paul N.
John, Eleanor
Wade, Bridget S.
D'HAENENS, Simon
Lear, Caroline H.
author_sort Pearson, Paul N.
title Spine-like structures in Paleogene muricate planktonic foraminifera
title_short Spine-like structures in Paleogene muricate planktonic foraminifera
title_full Spine-like structures in Paleogene muricate planktonic foraminifera
title_fullStr Spine-like structures in Paleogene muricate planktonic foraminifera
title_full_unstemmed Spine-like structures in Paleogene muricate planktonic foraminifera
title_sort spine-like structures in paleogene muricate planktonic foraminifera
publisher COPERNICUS GESELLSCHAFT MBH
publishDate 2022
url http://hdl.handle.net/1942/38039
https://doi.org/10.5194/jm-41-107-2022
genre Planktonic foraminifera
genre_facet Planktonic foraminifera
op_relation Journal of micropalaeontology, 41 (2) , p. 107 -127
http://hdl.handle.net/1942/38039
127
2
107
41
doi:10.5194/jm-41-107-2022
000834136600001
op_rights Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.
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op_doi https://doi.org/10.5194/jm-41-107-2022
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