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<p>Two filamentous cyanobacteria, isolated from different habitats in Yunnan Province, China, were described. Phylogenetic analysis and taxonomic identification were performed using a polyphasic approach that included morphological, ecological, and molecular data. Their morphological characteristics and microscopic structures were observed and recorded using an optical microscope. Filaments of the strain SXACC0113 are yellowish-green and relatively wide, ranging from 1.1 to 4.8 μm, and the cells are sometimes inflated. Strain SXACC0116 have no false branching, and the apical cells are cylindrical. Phylogenetic trees were constructed using maximum likelihood (ML) and bayesian inference (BI) based on the 16S rRNA gene sequences. The analysis showed that the algal strain SXACC0113 was distributed in the <i>Elainella</i> clade, and its similarity to the 16S rRNA genes of other species in the genus <i>Elainella</i> was 97.9–98.2%. The strain SXACC0116 was distributed in the Pegethrix clade, and its similarity to the 16S rRNA genes of other species in the genus <i>Pegethrix</i> was 95.4%–97.3%. Additionally, unique forms were found in the D1-D1’, Box B, and V3 helices of the 16S–23S internal transcribed spacer (ITS) secondary structure in these strains. These findings support the establishment of two new species, named <i>Elainella yunnanensis</i> sp. nov. and <i>Pegethrix yunnanensis</i> sp. nov. This discovery increases the diversity of cyanobacterial species in China, provides a scientific basis for further revision and classification of cyanobacteria, and supplements algae research information in China.</p>

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Description of new species of Oculatellaceae (Oculatellales, Cyanobacteria) from China based on the polyphasic approach

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Jie Wang,
  • Ting Zhang,
  • Xianli Yue,
  • Qinghua Wang,
  • Mingyang Xu,
  • John Patrick Kociolek,
  • Jingchun Li,
  • Qi Liu

摘要

Two filamentous cyanobacteria, isolated from different habitats in Yunnan Province, China, were described. Phylogenetic analysis and taxonomic identification were performed using a polyphasic approach that included morphological, ecological, and molecular data. Their morphological characteristics and microscopic structures were observed and recorded using an optical microscope. Filaments of the strain SXACC0113 are yellowish-green and relatively wide, ranging from 1.1 to 4.8 μm, and the cells are sometimes inflated. Strain SXACC0116 have no false branching, and the apical cells are cylindrical. Phylogenetic trees were constructed using maximum likelihood (ML) and bayesian inference (BI) based on the 16S rRNA gene sequences. The analysis showed that the algal strain SXACC0113 was distributed in the Elainella clade, and its similarity to the 16S rRNA genes of other species in the genus Elainella was 97.9–98.2%. The strain SXACC0116 was distributed in the Pegethrix clade, and its similarity to the 16S rRNA genes of other species in the genus Pegethrix was 95.4%–97.3%. Additionally, unique forms were found in the D1-D1’, Box B, and V3 helices of the 16S–23S internal transcribed spacer (ITS) secondary structure in these strains. These findings support the establishment of two new species, named Elainella yunnanensis sp. nov. and Pegethrix yunnanensis sp. nov. This discovery increases the diversity of cyanobacterial species in China, provides a scientific basis for further revision and classification of cyanobacteria, and supplements algae research information in China.