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A cosmopolitan calcifying benthic foraminifera in agglutinated disguise as a geochemical recorder of coastal environments

Sosnitsky T. (1), Krekova V. (1), Elisha B. (1), Sadekov A.(2), Torfstein A. (3,4), Holzmann M. (5), Li H. (2), Abramovich S. (1), Ashckenazi-Polivoda S. (6,7)

(1) Department of Earth and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva 84105

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(3) The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel

(4) Interuniversity Institute for Marine Sciences, Eilat 88103, Israel,Interuniversity Institute for Marine Sciences, Eilat 88103, Israel

(5) 1 Department of Earth and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel.
2 Centre for Microscopy, Characterisation & Analysis, The University of Western Australia, Perth 6009, Australia.
3 The Fredy & Nadin Herrman Institute of Earth Sciences, The Hebrew University, The Edmond J. Safra Campus -Givat Ram, Jerusalem 9190401, Israel.
4 The Interuniversity Institute for Marine Sciences, Eilat 8810302, Israel.
5 Department of Genetics and Evolution, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland
6 Dead Sea and Arava Science Center, Masada National Park, Mount Masada, 86910, Israel.
7 Ben-Gurion University of the Negev, Eilat Campus 8855630, Israel.

Calcifying foraminifera from the orders Rotaliida and Miliolida are widely used as geochemical proxies for recording paleoceanographic conditions, while agglutinated foraminifera are often overlooked since their tests are mostly composed of foreign particles. This study investigated the geochemical properties of Textularia agglutinans, a cosmopolitan agglutinated benthic species from the order Textulariida which has an exceptional inner calcareous test and is evolutionarily basal to Rotaliida. This study confirms the evolutionary link between textulariids and rotaliids based on their geochemistry and establishes T. agglutinans as a new geochemical recorder of marine environments. Specimens from the Mediterranean coast of Israel were analyzed using laser ablation ICP-MS and compared to whole-test ICP-MS measurements of rotaliid and miliolid taxa from the same location. An Mg/Ca temperature calibration was established by LA-ICP-MS analyses of cultured specimens at 15°, 17°, 20°, and 25 °C. Results show that T. agglutinans is a mid-Mg species (~19 to ~60 mmol/mol), with an Mg/Ca temperature correlation similar to high-Mg species. Its Pb, Zn and Mn/Ca ratios are variable, generally overlapping with rotaliids and significantly lower than miliolids. Notably, T. agglutinans exhibits significantly higher Sr/Ca ratios (3.2-4.7 mmol/mol) compared to most foraminifera. Raman analyses reveal that the inner wall comprises a mix of aragonite and calcite, explaining these elevated Sr/Ca ratios. Rotaliida are the most prolific group of calcifying foraminifera. Our findings suggest that rotaliid tests evolved from an agglutinated textulariid ancestor with an inner aragonitic wall, a hypothesis that is further supported by the close phylogenetic relationship of the two groups.

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