Pseudogomphonema lukinicum sp. nov. (Bacillariophyceae), a new endophytic diatom found inside multicellular red algae from the Northwest Pacific

Inna V. Stonik; Anna V. Skriptsova

doi:10.1515/bot-2024-0029

Article

Pseudogomphonema lukinicum sp. nov. (Bacillariophyceae), a new endophytic diatom found inside multicellular red algae from the Northwest Pacific

Inna V. Stonik

Inna V. Stonik holds a position of senior researcher at A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences. Her research is focused mainly on morphology, diversity, and ecology of marine diatoms.
and Anna V. Skriptsova

Anna V. Skriptsova graduated from Far-Eastern State University in 1995. She received her PhD in hydrobiology in 1999. Her current research interests include molecular phylogeny and taxonomy of marine algae, marine floristics and ecology of marine hard bottom communities.

Published/Copyright: June 24, 2024

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From the journal Botanica Marina Volume 67 Issue 4

Abstract

In our collections from the Northwest Pacific waters, we found several specimens of the red algae Lukinia dissecta and Callophyllis perestenkoae with darker spots on their thalli, which contained an unusual pennate diatom. A detailed morphological analysis based on light and scanning electron microscopy observations made it possible to describe a new species of endophytic diatom, Pseudogomphonema lukinicum sp. nov. Stonik et Skriptsova. The new species has some morphological features typical of the genus, such as the heteropolarity of the valves, the presence of pseudosepta and small apical chambers at both poles of the valves, and nonporous girdle bands. Pseudogomphonema lukinicum has been described and distinguished from the other species in the genus on the basis of a combination of morphological traits, including relatively small cell dimensions, a slightly asymmetrical valve to the transapical axis, with obtusely rounded headpole and narrower footpole, the large asymmetrical central area, and the presence of apical chambers at both poles. Pseudogomphonema lukinicum is the second representative of Pseudogomphonema known to be living endophytically. The data on the species composition of endophytic diatoms in marine macroalgae, their habitats, and host organisms reported in the literature to date are summarized.

Keywords: Pseudogomphonema ; diatoms; endophytes; Lukinia dissecta ; Callophylis perestenkoae ; Northwest Pacific

Corresponding author: Inna V. Stonik, Laboratory of Marine Microbiota, Laboratory of Autotrophic Organisms, A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, ul. Palchevskogo 17, Vladivostok, 690041, Russia, E-mail: innast2004@mail.ru

Funding source: Federal Service for Hydrometeorology and Environmental Monitoring of the Russian Federation

Award Identifier / Grant number: agreement no. 169-15-2023-002

About the authors

Inna V. Stonik

Inna V. Stonik holds a position of senior researcher at A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences. Her research is focused mainly on morphology, diversity, and ecology of marine diatoms.

Anna V. Skriptsova

Anna V. Skriptsova graduated from Far-Eastern State University in 1995. She received her PhD in hydrobiology in 1999. Her current research interests include molecular phylogeny and taxonomy of marine algae, marine floristics and ecology of marine hard bottom communities.

Acknowledgments

We are deeply grateful to the divers A.S. Oskolkov, K.K. Dudka, and I.N. Ivanov for their assistance in collecting algae. We also thank G.G. Zhigadlova from the Kamchatka Branch of the Pacific Geographical Institute for providing two specimens of Lukinia dissecta used in the present study. Special thanks are due to E. Shvetsov and A. Chera for their help in proofreading the English of the manuscript.

Research ethics: Not applicable.
Author contributions: I.V. Stonik: original concept, diatom identification, light microscopy and SEM, manuscript preparation; A.V. Skriptsova: original concept, algae collection and identification, manuscript preparation. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The authors state no competing interests.
Research funding: Analysis of the species composition of endophytic diatoms in marine macroalgae, and their habitats was carried out within the framework of the state assignment of A.V. Zhirmunsky National Scientific Center of Marine Biology, FEB RAS. A detailed morphological analysis of a new species of endophytic diatom was supported in part by the Federal Service for Hydrometeorology and Environmental Monitoring of the Russian Federation, agreement no. 169-15-2023-002.
Data availability: Not applicable.

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Received: 2024-04-15

Accepted: 2024-05-28

Published Online: 2024-06-24

Published in Print: 2024-08-27

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https://doi.org/10.1515/bot-2024-0029

Keywords for this article

Pseudogomphonema; diatoms; endophytes; Lukinia dissecta; Callophylis perestenkoae; Northwest Pacific