Morphology and genetic analysis of Coolia malayensis (Dinophyceae) from the North Viet Nam

Phan Tan Luom, Huynh Thi Ngoc Duyen, Tran Thi Minh Hue, Pham Xuan Ky, Nguyen Xuan Vy, Dao Viet Ha
Author affiliations

Authors

  • Phan Tan Luom Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam
  • Huynh Thi Ngoc Duyen Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam
  • Tran Thi Minh Hue Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam
  • Pham Xuan Ky Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam
  • Nguyen Xuan Vy Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam
  • Dao Viet Ha Institute of Oceanography, Vietnam Academy of Science and Technology, 01 Cau Da Street, Nha Trang Ward, Khanh Hoa, Viet Nam https://orcid.org/0000-0002-4996-501X

DOI:

https://doi.org/10.15625/2525-2518/20664

Keywords:

Coolia malayensis, Gulf of Tonkin, LSU, morphology, Viet Nam

Abstract

In this study, two strains of Coolia malayensis isolated from macroalgae Padina spp. and Sargassum spp. collected in the Gulf of Tonkin, Viet Nam were identified and described using morphological characteristics and phylogenetic analysis. Detailed morphological characterization of C. malayensis was described and illustrated with light and scanning electron microscope images. C. malayensis from Viet Nam had morphological features similar to previous descriptions of the species, including the 3”’ plate being larger than the 4”’ plate. However, the shape of the 3’ plate of C. malayensis from Viet Nam is pentagonal, while it is quadrangular in the original description from Malaysia. In phylogenetic analyses of the LSU rDNA (D8-D10 region), the Vietnamese strains of C. malayensis were grouped with the Macauley Island (New Zealand) strain and the strain of Coolia sp. from Japan with full support value (ML = 100 and BI = 1.0). The intraspecific pairwise distance (p-distance) and the number of different nucleotides among all C. malayensis strains from Viet Nam, New Zealand and Japan ranged from 0 % (0 bp) to 0.12 % (1 bp), and from 0.25 % (2 bp) to 0.37 % (3 bp), respectively.

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Published

25-06-2026

How to Cite

Luom, P. T., Duyen, H. T. N., Hue, T. T. M., Ky, P. X., Vy, N. X., & Ha, D. V. (2026). Morphology and genetic analysis of Coolia malayensis (Dinophyceae) from the North Viet Nam. Vietnam Journal of Science and Technology, 64(3), 542–553. https://doi.org/10.15625/2525-2518/20664

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