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Morphological and phylogenetic analysis of a new Melosira species and revision of freshwater Melosira in China

  • Biology
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Abstract

Melosira is one of the most common diatom genera found in freshwater ecosystems. There are many freshwater species of Melosira, of which M. varians is the most common. In our investigation of periphytic diatoms in the Jinsha River, China, a new species, M. capsularum sp. nov, was characterized in combined morphological and molecular approaches. M. varians was also analyzed using molecular data. The new species is similar to M. varians, M. moniliformis, M. nummuloides, and M. lineata in morphology. The cells are capsular and join to filaments by mucilage pads that are secreted on the valve face and united into pairs by their cingula. The valve face is domed and covered with small granules, and the valve mantle edge has a milled appearance. The two strains of M. capsularum are in a single clade obviously away from other Melosira species, as determined in phylogenetic analysis based on nuclear small subunit (SSU) rDNA sequences and the chloroplast-encoded rbcL gene. Thus, the results of morphological comparisons and phylogenetic analysis based on molecular data provide strong evidence that M. capsularum is a new species, thereby increasing the total number of recognized freshwater diatom species in China. In addition, we have systematically reclassified the freshwater Melosira that have been recorded in China.

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Data Availability Statement

All of the data obtained and/or analyzed in this study are available from the corresponding author upon request.

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Authors and Affiliations

  1. College of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai, 200235, China

    Lin Yang & Guisheng Li

  2. College of Life Sciences, Shanghai Normal University, Shanghai, 200235, China

    Lin Yang, Pan Yu, Qingmin You & Quanxi Wang

  3. Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430000, China

    Pan Yu

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  1. Lin Yang
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  2. Pan Yu
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  3. Qingmin You
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  4. Guisheng Li
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  5. Quanxi Wang
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Correspondence to Quanxi Wang.

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Supported by the Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment, China (No. 2019HJ2096001006) and the National Natural Science Foundation of China (No. 31770222)

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Yang, L., Yu, P., You, Q. et al. Morphological and phylogenetic analysis of a new Melosira species and revision of freshwater Melosira in China. J. Ocean. Limnol. 40, 712–728 (2022). https://doi.org/10.1007/s00343-021-0470-x

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