Biogeosciences
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Articles | Volume 23, issue 5
Articles | Volume 23, issue 5
https://doi.org/10.5194/bg-23-2023-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-23-2023-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 23, issue 5
Research article
 | 
18 Mar 2026
Research article |  | 18 Mar 2026

The 3D submicron-scale skeletal reconstruction of Nannoconus (Cretaceous calcareous nannofossil) – Insights into biomineralization

Rajkumar Chowdhury, Redhouane Boudjehem, Baptiste Suchéras-Marx, Maxime Dupraz, Anico Kulow, Julio Cesar da Silva, Jean Louis Hazemann, Marie-Pierre Aubry, Javier Pérez, Alejandro Fernandez-Martinez, and Fabienne Giraud

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Latest update: 02 Oct 2026
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Short summary
Nannoconus, a major marine planktonic biocarbonate producer of the Early Cretaceous (150–120 Ma), biomineralized heavy (200–1400 picogram) skeletons (5–20 μm) of interlocking lamellae spanned around a central canal, by an unknown process. With the first-ever application of synchrotron-based ptychographic X-ray computed tomography (PXCT) of nanometric resolution, we reconstructed the 3D skeleton by combining segments of lamellae and inferred its possible biomolecule(s)-“templated” calcification.
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