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Swiss Journal of Geosciences

, Volume 111, Issue 3, pp 511–522 | Cite as

The Planktonic foraminifera Globigerinoides eoconglobatus n. sp. in a glacial–interglacial context: IODP359 Sites U1467 and U1468

  • Stephanie Stainbank
  • Silvia Spezzaferri
  • Dick Kroon
  • Erica S. de Leau
  • Andres Rüggeberg
Article

Abstract

Here we define a new morphospecies of planktonic foraminifera Globigerinoides eoconglobatus n. sp., identified from International Ocean Discovery Program (IODP) expedition 359 samples from drift deposits of the Maldives, Inner Sea. Through biostratigraphic analysis, we infer it may be the direct ancestor of Globigerinoides conglobatus evolving from Globigerinoides obliquus in the Late Miocene (Subzone M13a). Globigerinoides eoconglobatus n. sp. can be distinguished from G. conglobatus through both its morphological traits and stable isotopic signature (δ18O and δ13C) in pre-adult and adult specimens. The most defining characteristic being its aperture height (AH). A variance in adult stable isotopic signals shows a possible difference in life strategies, possibly related to symbionts (presence/absence or concentration) and/or depth habitat. This work also tentatively shows G. eoconglobatus n. sp. and G. conglobatus abundances are linked to glacial–interglacial stages. Its low abundances and similarities to its descendent Globigerinoides conglobatus has likely accounted for it being unreported, until present, in both modern and fossil studies.

Keywords

Planktonic foraminifera Globigerinoides eoconglobatus Stable isotopes Maldives IODP 

Notes

Acknowledgements

The authors would like to thank the International Ocean Discovery Program for supplying the samples used in our study. Colin Chilcott is acknowledged for assistance during the stable isotope analysis at the Grant Institute, University of Edinburgh. The two anonymous reviewers are thanked for their valuable comments on the manuscript. This study was supported by funding from the Swiss National Science Foundation (200021_165852/1).

Supplementary material

15_2018_304_MOESM1_ESM.docx (1.8 mb)
Supplementary material 1 (DOCX 1868 kb)

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Copyright information

© Swiss Geological Society 2018

Authors and Affiliations

  1. 1.Department of GeosciencesUniversité of FribourgFribourgSwitzerland
  2. 2.School of GeoSciencesGrant Institute, University of EdinburghEdinburghUK

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