Thalassiosira tealata Takano, 1980 (Bacillariophyta), a Species of Diatoms New to the Seas of Russia

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Abstract

The diatom Thalassiosira tealata Takano, 1980 was identified using a scanning electron microscope, as a result of the study of phytoplankton in coastal waters of the Peter the Great Gulf, Sea of Japan, and first noted in the seas of Russia. The T. tealata strain and the nucleotide sequence of the 18S rDNA gene used for molecular genetic analysis were obtained. A detailed description of the species is provided, supplemented by microphotographs and data on its distribution.

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About the authors

M. A. Shulgina

Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences

Author for correspondence.
Email: annekee@mail.ru
ORCID iD: 0000-0002-4744-9230
Russian Federation, Vladivostok, 690041

D. I. Kachur

Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences

Email: annekee@mail.ru
ORCID iD: 0009-0004-9612-2391
Russian Federation, Vladivostok, 690041

References

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2. Fig. 1. Thalassiosira tealata. a – cells are united in chains (the arrow indicates the cord); b – general view of the valve (the short arrow indicates the central process with supports, the white arrow indicates the marginal process with supports, the black arrow indicates the bilabiate process); c – marginal process with supports; d – internal part of the valve (the short arrow indicates the central process with supports, surrounded by three satellite pores; the white arrow indicates the marginal process with supports, surrounded by four satellite pores; the black arrow indicates the bilabiate process); d – part of the valve showing the cribrum; e – cingulum, c – valvocopula, k – copula, P1 and P2 – pleurae; a – CM, b–e – SEM. Scale: a – 20 μm, b, c, d, f – 1 μm, d – 2 μm.

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3. Fig. 2. Rooted BI tree showing the phylogenetic relationships among species of the genus Thalassiosira. The tree reconstruction is based on 18S rDNA sequences using the BI, NJ, MP, and ML algorithms. Node values ​​are the percentage estimate of the stability of the topology from 1000 repetitions of the nonparametric bootstrap test for NJ, MP, ML, respectively, and the percentage values ​​of the posterior probabilities of the nodes for BI. Numbers I and II mark two phylogroups.

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