

FOLLOWUS
1.College of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai 200235, China
2.College of Life Sciences, Shanghai Normal University, Shanghai 200235, China
3.Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430000, China
Quanxi WANG, E-mail: wangqx@shnu.edu.cn
收稿:2020-12-11,
录用:2021-1-26,
网络首发:2021-04-08,
纸质出版:2022-03
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Morphological and phylogenetic analysis of a new
Lin YANG, Pan YU, Qingmin YOU, et al. Morphological and phylogenetic analysis of a new
Morphological and phylogenetic analysis of a new
Lin YANG, Pan YU, Qingmin YOU, et al. Morphological and phylogenetic analysis of a new
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
rbc
L 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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