ORIGINAL RESEARCH article
Front. Microbiol.
Sec. Aquatic Microbiology
Comprehensive analysis of the diatom genus Psammodictyon from Viet namNam: new species, molecular data and fatty acid content
Provisionally accepted
Elena Kezlya1*
Dmitry Kapustin1
Zinaida Krivova1Yevhen Maltsev1
Lam Nguyen-Ngoc2
Duyen T.N. Huynh2
Hai Doan-Nhu2*
Maxim Kulikovskiy1- 1Institute of Plant Physiology, Russian Academy of Sciences (RAS), Moscow, Russia
- 2Institute of Oceanography Nha Trang, Nha Trang, Vietnam
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Psammodictyon is a widely distributed marine diatom genus with an intricate taxonomy and an underestimated species diversity. In this study, 12 strains of Psammodictyon were isolated from the coastal waters of Central Viet Nam. Based on the detail morphological examinations using light and scanning electron microscopy and molecular phylogenetic analysis, we propose six new species to science. Our phylogenetic analysis showed that Psammodictyon represents a closely related monophyletic group. The resolution of the short genetic markers (V4, V9 18S rRNA, V9-ITS1 18S rRNA and short region of rbcL), which are widely used for metabarcoding, is also dis-cussed. Analysis of the fatty acid content of seven Psammodictyon strains showed that they, like most diatoms, accumulate high levels of polyunsaturated fatty acids (29.44–42.62%) and mono-unsaturated fatty acids (20.2–23.2%). So, Psammodictyon strains might be considered as potential producers of long-chain omega-3 polyunsaturated fatty acids.
Keywords: Diatoms, morphology, Taxonomy, phylogeny, SEM, PUFA
Received: 08 Sep 2025; Accepted: 27 Oct 2025.
Copyright: © 2025 Kezlya, Kapustin, Krivova, Maltsev, Nguyen-Ngoc, Huynh, Doan-Nhu and Kulikovskiy. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Elena Kezlya, melosira@mail.ru
Hai Doan-Nhu, haidoan-ion@planktonviet.com
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