Morphology and phylogeny of two novel species within the section <italic style="font-style: italic">Chaetoceros</italic> (Chaetocerotaceae, Bacillariophyta)

Jiangxue HUANG; Mengyi ZHAI; Xudan LU; David U. HERNÁNDEZ-BECERRIL; Yang LI

doi:10.1007/s00343-024-4157-y

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Morphology and phylogeny of two novel species within the section Chaetoceros (Chaetocerotaceae, Bacillariophyta)

Biology | Updated：2025-08-07

- Morphology and phylogeny of two novel species within the section Chaetoceros (Chaetocerotaceae, Bacillariophyta)
- Journal of Oceanology and Limnology Vol. 43, Issue 4, Pages: 1334-1349(2025)
- 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.Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
- Author bio：
  
  li-3-yang@163.com
- Funds：
- DOI：10.1007/s00343-024-4157-y
  CLC：
- Received：11 June 2024，
  
  Published：01 July 2025
- Accepted：
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HUANG Jiangxue,ZHAI Mengyi,LU Xudan,et al.Morphology and phylogeny of two novel species within the section Chaetoceros (Chaetocerotaceae, Bacillariophyta)[J].Journal of Oceanology and Limnology,2025,43(04):1334-1349.
DOI：

HUANG Jiangxue,ZHAI Mengyi,LU Xudan,et al.Morphology and phylogeny of two novel species within the section Chaetoceros (Chaetocerotaceae, Bacillariophyta)[J].Journal of Oceanology and Limnology,2025,43(04):1334-1349. DOI： 10.1007/s00343-024-4157-y.

摘要

Abstract

Chaetoceros

is a species-diverse genus of marine diatoms. The section

Chaetoceros

recognized for the presence of numerous chloroplasts in both cell body and setae

is a common group of marine phytoplankton containing some species

which may cause harm to marine organisms due to the robust setae. Modern taxonomic studies combining morphological and molecular data are still limited for the section

Chaetoceros

. To explore the diversity of the section

Chaetoceros

monoclonal strains were established from the South China Sea and two novel species are described here

tetracarina

sp. nov. and

dicrinis

sp. nov.

Chaetoceros

tetracarina

is unique by the rimoportula on the anterior valve having four basal ridges supporting the external tube

whereas the other rimoportulae in the same chains or the one on the posterior valve for single cells each only possess a long external tube and lack basal ridges.

Chaetoceros

dicrinis

is solitary and characterized by the symmetrical extending of the two setae on the same valve under light microscope (LM). The phylogenetic results show the presence of several groups within the section

Chaetoceros

tetracarina

was sister to

. cf.

pseudodichaeta

but differed by 33 and 46 bps in ribosomal large-subunit (LSU) and small-subunit (SSU) sequences respectively. The most closely-related species of

dicrinis

was

denticulatus

but they were distinctly different morphologically

differing by 3 and 2 bps in LSU and SSU sequences respectively. This study provides new findings to understand the diversity of section

Chaetoceros

; however the inner relationships within this s

ection remain largely unresolved.

关键词

Keywords

references

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Morphology and phylogeny of two novel species within the section Chaetoceros (Chaetocerotaceae, Bacillariophyta)

DOI：10.1007/s00343-024-4157-y

摘要

Abstract

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