Taxonomy and phylogeny of the section <italic style="font-style: italic">Chaetoceros</italic> (Chaetocerotaceae, Bacillariophyta), with description of two new species

Xudan LU; Mengyi ZHAI; Nina LUNDHOLM; Yang LI

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Taxonomy and phylogeny of the section Chaetoceros (Chaetocerotaceae, Bacillariophyta), with description of two new species

Biology | Updated：2024-10-11

- Taxonomy and phylogeny of the section Chaetoceros (Chaetocerotaceae, Bacillariophyta), with description of two new species
- Journal of Oceanology and Limnology Vol. 42, Issue 4, Pages: 1286-1311(2024)
- Affiliations：
  
  1.Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, College of Life Science, South China Normal University, Guangzhou 510631, China
  2.Natural History Museum of Denmark, University of Copenhagen, Copenhagen K 1353, Denmark
- Author bio：
  
  li-3-yang@163.com
- Funds：
- DOI：
  CLC：
- Received：10 June 2023，
  
  Online First：21 September 2023，
  
  Published：01 July 2024
- Accepted：
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LU Xudan,ZHAI Mengyi,LUNDHOLM Nina,et al.Taxonomy and phylogeny of the section Chaetoceros (Chaetocerotaceae, Bacillariophyta), with description of two new species[J].Journal of Oceanology and Limnology,2024,42(04):1286-1311.
DOI：

LU Xudan,ZHAI Mengyi,LUNDHOLM Nina,et al.Taxonomy and phylogeny of the section Chaetoceros (Chaetocerotaceae, Bacillariophyta), with description of two new species[J].Journal of Oceanology and Limnology,2024,42(04):1286-1311. DOI：

摘要

Abstract

Chaetoceros

Ehrenberg is one of the most diverse genera of planktonic diatoms. The species in section

Chaetoceros

are characterized by cells and setae having numerous chloroplasts and being widely distributed. However

the delimitations of some species are problematic because of limited morphological information in the classical descriptions. Monoclonal strains of the section

Chaetoceros

were established

morphological features were studied using light and electron microscopy

and the hypervariable D1‍‍‍–‍D3 region of the nuclear ribosomal large subunit gene was sequenced to address phylogenetic relationships. Fifteen species belonging to the section

Chaetoceros

were recorded

including two new species

hainanensis

sp. nov. and

tridiscus

sp. nov.

Chaetoceros

hainanensis

was characterized by straight chains

narrowly lanceolate to hexagonal apertures

sibling setae diverging in nearly right angles

stipule-shaped spines on terminal setae and arrowhead-shaped spines on intercalary setae.

tridiscus

had short straight chains

narrowly lanceolate apertures

arrowhead-shaped spines and circular poroids arranged in a grid pattern on terminal and intercalary setae. The phylogenetic analyses revealed six groups formed by 19 species within the section

Chaetoceros

which was found to be monophyletic. The subdivision of the section is still not well understood. The morphological characters within each group varied considerably and molecular information on more species are needed to enrich the phylogenetic profiling.

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Keywords

references

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Taxonomy and phylogeny of the section Chaetoceros (Chaetocerotaceae, Bacillariophyta), with description of two new species

DOI：

摘要

Abstract

关键词

Keywords

references