Morphology and phylogeny of <italic style="font-style: italic">Pseudoedtheriotia</italic>, a new genus of diatom (Stephanodiscaeae), with a description of a new species, <italic style="font-style: italic">P</italic>. <italic style="font-style: italic">radiosa</italic>

Pan YU; Lin YANG; John Patrick KOCIOLEK; Qi LIU; Wanting PANG; Quanxi WANG; Qingmin YOU

doi:10.1007/s00343-026-5170-0

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Morphology and phylogeny of Pseudoedtheriotia, a new genus of diatom (Stephanodiscaeae), with a description of a new species, P. radiosa

Updated：2026-09-17

- Morphology and phylogeny of Pseudoedtheriotia, a new genus of diatom (Stephanodiscaeae), with a description of a new species, P. radiosa
- Journal of Oceanology and Limnology Pages: 1-22(2026)
- Affiliations：
  
  1.School of Environment and Geographical Sciences, Shanghai Normal University, Shanghai 200234, China
  2.Yangtze River Delta Urban Wetland Ecosystem National Field Scientific Observation and Research Station, Shanghai 200234, China
  3.College of Life Sciences, Shanghai Normal University, Shanghai 200234, China
  4.College of Life Sciences, Hengshui University, Hengshui 053010, China
  5.Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, UCB 218, Boulder CO80309, USA
  6.School of Life Sciences, Shanxi University, Taiyuan 030006, China
- Author bio：
  
  youqm1117@shnu.edu.cn
- Funds：
- DOI：10.1007/s00343-026-5170-0
  CLC：
- Received：10 June 2025，
  
  Online First：17 September 2026，
- Accepted：
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YU Pan,YANG Lin,KOCIOLEK John Patrick,et al.Morphology and phylogeny of Pseudoedtheriotia, a new genus of diatom (Stephanodiscaeae), with a description of a new species, P. radiosa[J].Journal of Oceanology and Limnology,
DOI：

YU Pan,YANG Lin,KOCIOLEK John Patrick,et al.Morphology and phylogeny of Pseudoedtheriotia, a new genus of diatom (Stephanodiscaeae), with a description of a new species, P. radiosa[J].Journal of Oceanology and Limnology, DOI：.

摘要

Abstract

Pseudoedtheriotia

radiosa

P. Yu

Q. M. You

J. P. Kociolek

Q. X. Wang

gen. et sp. nov.

a new freshwater diatom is proposed from Qingjing River

Hubei Province

China

based on light and scanning electron microscopy observations

as well as molecular analysis. Diagnostic features of the new genus include: individual domed cribra on the valve face and individual areolae around the valve margin that are without occlusions; central area has valve face fultoportulae which have two arcuate opercles internally; lack of rimoportulae. Additionally

genetic distance and phylogenetic analyses of based on the chloroplast-encoded

rbc

L gene and nuclear small subunit (SSU) rDNA sequences suggested that the two strains of

Pseudoedtheriotia

radiosa

inves

tigated here could together be identified as a separate genus distinct from other similar genera (

Discostella

Cyclotella

Edtheriotia

Stephanodiscus

Cyclostephanos

et al.) belonging to Stephanodiscales. These molecular data and morphological characters suggest an affinity of the new genus to the Stephanodiscaeae. In the set of diagnostic characters

especially the lack of rimoportulae

Pseudoedtheriotia

is easily differentiated from these other genera. Furthermore

our phylogenetic analysis revealed complex relationships among several families

including Stephanodiscaceae

Thalassiosiraceae

and Skeletonemataceae

indicating that the current family-level classification within this group requires critical re-evaluation.

关键词

Keywords

references

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School of Environmental and Geographical Sciences, Shanghai Normal University

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Morphology and phylogeny of Pseudoedtheriotia, a new genus of diatom (Stephanodiscaeae), with a description of a new species, P. radiosa

DOI：10.1007/s00343-026-5170-0

摘要

Abstract

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