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Issue: Vol. 700 No. 3: 9 May 2025
Type: Article
Published: 2025-05-09
DOI: 10.11646/phytotaxa.700.3.2
Page range: 257-268
Abstract views: 150
PDF downloaded: 6

Gomphonema baishaensis sp. nov. (Bacillariophyta, Gomphonemataceae), a new diatom species from Guangdong Province, China

Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado-80309, USA
Yunnan Key Laboratory of Ecological Protection and Resource Utilization of River-lake Networks, Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China
morphology scanning electron microscopy taxonomy Algae

Abstract

This study describes a new species, Gomphonema baishaensis sp. nov., from epilithic samples taken from the Baisha River in the Pearl River Basin. In July 2021, epilithic samples were collected from sunken rocks by scrubbing with a toothbrush. Specimens were analyzed using light (LM) and scanning electron microscopy (SEM), revealing morphological features: heteropolar clavate valves, with the widest region closer to the apex than the central area in larger specimens; uniseriate rows of perpendicular slit-shaped areolae transitioning to biseriate rows near the mantle; uninterrupted striae extending to the mantle; double rows of slit-like areolae near the apices. Key diagnostic traits differentiating it from similar species (G. tamilensis, G. clavatulum, G. spirkovskae, and G. insigniforme) include higher striae density, valve outline, length and width, and areola composition. Environmental factors were measured including pH (8.1), water temperature (32.2 °C), conductivity (225 µS/cm) and dissolved oxygen (DO 7.91 mg/L). These findings increase our understanding of the morphology and distribution of the genus Gomphonema in China.

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How to Cite

Huang, J.-M., Guo, J.-S., Ni, H.-P., Xiao, Q.-Z., Kociolek, J.P. & Li, Y.-L. (2025) Gomphonema baishaensis sp. nov. (Bacillariophyta, Gomphonemataceae), a new diatom species from Guangdong Province, China. Phytotaxa 700 (3): 257–268. https://doi.org/10.11646/phytotaxa.700.3.2