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<p>The dinoflagellate genus <i>Scrippsiella</i> is a common member of phytoplankton. However, the diversity of <i>Scrippsiella</i> in Korea has not been fully investigated. An unspecified <i>Scrippsiella</i> species was collected from Jangmok Bay, Geoje Island, Korea. Morphological characteristics of the species were examined using light, fluorescence and scanning electron microscopy. Molecular phylogeny was also analyzed based on a combined dataset of ITS and LSU rDNA. The Korean isolate exhibited a conical epitheca and a hemispherical hypotheca and had distinctive asymmetric anterior intercalary plates, with the general plate formula of <i>Scrippsiella</i> species. These morphological features are identical to those of <i>S. irregularis</i>. The phylogenetic tree based on concatenated ITS and LSU rDNA sequences revealed that the Korean isolate was grouped with the clade comprising <i>S. irregularis</i>. However, based on the secondary structures of ITS1 and ITS2, <i>S. irregularis</i>, including the Korean isolate, was divided into three ribotypes: ribotype 1 consisting of the isolates from Iran, ribotype 2 consisting of the isolates from China and Korea, and ribotype 3 composed of an isolate from China. This finding suggests the presence of intraspecific genetic diversity within <i>S. irregularis</i>.</p>

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First Report of Scrippsiella irregularis Attaran-Fariman & Bolch (Dinophyceae) from Korean Coastal Waters

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Minseok Jeong,
  • Da Bin Choi,
  • Zhun Li,
  • Kyong Ha Han,
  • Jinik Hwang,
  • Hyeon Ho Shin

摘要

The dinoflagellate genus Scrippsiella is a common member of phytoplankton. However, the diversity of Scrippsiella in Korea has not been fully investigated. An unspecified Scrippsiella species was collected from Jangmok Bay, Geoje Island, Korea. Morphological characteristics of the species were examined using light, fluorescence and scanning electron microscopy. Molecular phylogeny was also analyzed based on a combined dataset of ITS and LSU rDNA. The Korean isolate exhibited a conical epitheca and a hemispherical hypotheca and had distinctive asymmetric anterior intercalary plates, with the general plate formula of Scrippsiella species. These morphological features are identical to those of S. irregularis. The phylogenetic tree based on concatenated ITS and LSU rDNA sequences revealed that the Korean isolate was grouped with the clade comprising S. irregularis. However, based on the secondary structures of ITS1 and ITS2, S. irregularis, including the Korean isolate, was divided into three ribotypes: ribotype 1 consisting of the isolates from Iran, ribotype 2 consisting of the isolates from China and Korea, and ribotype 3 composed of an isolate from China. This finding suggests the presence of intraspecific genetic diversity within S. irregularis.