Original scientific paper

https://doi.org/10.37427/botcro-2025-010

Cymbella stomachsis sp. nov. (Bacillariophyta; Cymbellaceae), a new species from Guangdong Province, China

Yi-Han Zhao ; Yunnan University, School of Ecology and Environmental Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Kunming 650500, P. R. China
Ji-Shu Guo ; Yunnan University, School of Ecology and Environmental Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Kunming 650500, P. R. China
Zheng-Bin Tang ; Yunnan University, School of Ecology and Environmental Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Kunming 650500, P. R. China
Yun Zhang ; Hubei Normal University, College of Life Sciences, Huangshi 435002, P. R. China
Shao-Feng Huang ; Center for Ecology and Environment Monitoring and Research, Administration for Pearl River Basin-South China Sea Ecology and Environment, Ministry of Ecology and Environment, Guangzhou 510611, P. R. China *
John Patrick Kociolek ; University of Colorado, Museum of Natural History and Department of Ecology and Evolutionary Biology, Boulder, Colorado-80309, USA
Yan-Ling Li ; Yunnan University, School of Ecology and Environmental Science, Institute for Ecological Research and Pollution Control of Plateau Lakes, Kunming 650500, P. R. China *

* Corresponding author.

Abstract

A new diatom species from the genus Cymbella C. Agardh is described from samples collected during a survey of freshwater diatoms from Modaomen Channel, Guangdong Province, China. With the aid of light microscopy (LM) and scanning electron microscopy (SEM), we give a detailed morphological description of Cymbella stomachsis sp. nov., which is placed in the genus Cymbella according to the shared features of asymmetry about the apical axis, deflection of the external terminal raphe fissures towards the dorsal margin, and the presence of apical pore fields and stigmata. Although it shares some similar structural features with C. tumida, C. stuxbergii, C. stuxbergioides, C. pesudostuxbergii, C. mexicana and C. australica, C. stomachsis sp. nov. is easily distinguished by the valve outline, the shape and density of areola, and the appearance of a lack of an intermissio at the central nodule. Especially, the structure of the intermissio is absent in similar taxa. This work is important for its enrichment of our understanding of the genus Cymbella and improvement of the database of diatom biodiversity and distribution in China.

Keywords

China; Cymbellaceae; diatom; morphology; Pearl River; taxonomy

Hrčak ID:

319700

URI

https://hrcak.srce.hr/319700

Publication date:

1.4.2025.

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