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Chinia gen. nov.—the second diatom genus simonsenioid raphe from mangroves in Fujian, China

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Abstract

A new monotypic diatom genus Chinia gen. nov. from estuarine mangrove habitats in Fujian, China is described. Light, scanning and transmission electron microscopy observations of its morphology show that this diatom differs from any established raphid diatom genus. The new genus is distinguished by a strongly undulate valve face, eccentric raphe canal, and perforated copulae. Its distinctly elevated and perforated raphe canal, classified as simonsenioid type, is supported by sparse infundibulum-like portulae, and the portulae are separated by large fenestrae. The valves of Chinia also have hymenate areolar occlusions and the raphe lacks a central nodule. However, unlike most Bacillariaceae with two plastids, including Simonsenia, Chinia has a single plastid similar to those in Entomoneis and Surirella. Despite the similarities to Simonsenia, Chinia features porous raphe canal and loose striation, which is different from those of Simonsenia that has a solid raphe canal and distinct rows of areolae. These distinctive cytological and morphological characters suggest an affinity of the new genus to the Bacillariaceae.

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Acknowledgment

We greatly appreciate the useful advice on this new genus provided by Prof. Tamotsu NAGUMO at the Nippon Dental University in Japan; Dr. Xueliang HOU at the School of Life Sciences, Xiamen University for his helpful suggestions on the nomenclature of this new genus and species, and Dr. Caiming WU, Dr. Luming YAO, and Ms. Jie LIU from Xiamen University for their assistance with EM observations. We are grateful to anonymous reviewers for their comments and suggestions which greatly improved this manuscript. The authors greatly appreciate English language edits and critical comments by Dr. Matt ASHWORTH, Texas State University at Austin.

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Authors and Affiliations

  1. School of Life Sciences and Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, China

    Huina Lin, Weiwei Wu, Xiaoye Li, Vishal Patil, Junrong Liang, Xuesong Li, Yahui Gao & Changping Chen

  2. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, China

    Lin Sun & Yahui Gao

  3. Institute of Marine and Environmental Sciences, University of Szczecin, Mickiewicza 16a, PL-70-383, Szczecin, Poland

    Andrzej Witkowski

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  1. Huina Lin
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  3. Lin Sun
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Correspondence to Yahui Gao or Changping Chen.

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Supported by the National Key Research and Development Program of China (No. 2016YFA0601302) and the National Natural Science Foundation of China (Nos. 42076114, 41876146, 41776124)

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Lin, H., Wu, W., Sun, L. et al. Chinia gen. nov.—the second diatom genus simonsenioid raphe from mangroves in Fujian, China. J. Ocean. Limnol. 40, 1220–1232 (2022). https://doi.org/10.1007/s00343-021-1067-0

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