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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 27, issue 2
J. Micropalaeontol., 27, 117–123, 2008
https://doi.org/10.1144/jm.27.2.117
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 27, 117–123, 2008
https://doi.org/10.1144/jm.27.2.117
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Nov 2008

01 Nov 2008

A new serial Cretaceous planktic foraminifer (Family Heterohelicidae Cushman, 1927) from the Upper Maastrichtian of the equatorial Central Pacific

M. Dan Georgescu1 and Sigal Abramovich2 M. Dan Georgescu and Sigal Abramovich
  • 1Department of Geoscience, University of Calgary, 2500 University Drive Northwest, Calgary, Alberta T2N 1N4, Canada (e-mail: )
  • 2Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, PO Box 653, Beer Sheva 84105, Israel

Keywords: planktic foraminifera, Upper Cretaceous, equatorial Central Pacific, taxonomy, Lipsonia lipsonae nov. gen, nov. sp

Abstract. A new serial planktic foraminifer, Lipsonia lipsonae nov. gen., nov. sp., is reported from the Upper Maastrichtian sediments of the equatorial Central Pacific (Shatsky Rise). It presents raised sutures throughout, ornamentation consisting of coarse irregular structures on the early part of the test and smooth test surface in the adult stage. The absence of costate ornamentation suggests that the new taxon origins should probably be found in the contemporaneous non-costate species of the Laeviheterohelix glabrans-L. dentata group. Lipsonia lipsonae presents morphological similarities with the Santonian genus Sigalia. The costate test surface and sutures of the latter indicates that it evolved from a costate species. Accordingly, Lipsonia and Sigalia are the results of iterative evolution from two different heterohelicid groups.

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