Abstract
Benthic dinoflagellates have been the subject of extensive taxonomic research in recent decades. Studies of morphologies of already known species of benthic dinoflagellates from various geographical populations remain relevant, as these allow elucidation of some details that were overlooked in the original species descriptions or assessment of their morphological variability. In the present study, two rare species of dinoflagellates, Amphidiniella sedentaria and Pachena cf. leibnizii, have been studied, for the first time, from coastal sands of the northwestern Sea of Japan. In the cells of A. sedentaria from the Sea of Japan, we have found two anterior intercalar plates instead of one. Therefore, the original formula has been changed to APC 4′ 2a 7″ 5c 4s 6‴ 2⁗. As a result of the examination of P. cf. leibnizii from the Sea of Japan, we have counted seven precingular plates and six cingular plates, instead of six and five, respectively, indicated in the original description. The plate formula of the cells of P. cf. leibnizii from the Sea of Japan is APC 4′ 3a 7″ 6c 5s 5‴ 2⁗. It is currently difficult to judge whether these differences are morphological variations. Therefore, we have identified these cells as P. cf. leibnizii.
About the authors
Marina S. Selina holds a position of Senior Researcher at the A.V. Zhirmunsky National Scientific Center of Marine Biology FEB RAS. Her research is focused mainly on taxonomy, diversity, and ecology of marine dinoflagellates, in particular sand-dwelling and epiphytic species. In addition, the area of her scientific expertise includes the distribution and species composition of phytoplankton in Far Eastern Seas of Russia.
Tatiana V. Morozova holds a position of Researcher at the A.V. Zhirmunsky National Scientific Center of Marine Biology FEB RAS. Her area of expertise includes morphology and ecology of marine planktonic and benthic dinoflagellates, and dinoflagellate cysts, their species composition and distribution in Far Eastern Seas of Russia.
Acknowledgments
Special thanks are due to Evgeny Shvetsov for his help in proofreading the English of the manuscript.
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Research ethics: Not applicable.
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Author contributions: Marina Selina: conceptualization, sampling, microscopy, original draft preparation, writing and editing; Tatiana Morozova: microscopy, preparing figures, editing. All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Competing interests: The authors declare no conflicts of interest regarding this article.
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Research funding: This study was supported by the Federal Service for Hydrometeorology and Environmental Monitoring of the Russian Federation, agreement no. 169-15-2023-002.
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Data availability: The raw data (photos) can be obtained on request from the corresponding author.
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