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Issue: Vol. 722 No. 1: 10 Oct. 2025
Type: Article
Published: 2025-10-10
DOI: 10.11646/phytotaxa.722.1.3
Page range: 29-40
Abstract views: 283
PDF downloaded: 14

Platessa congqiancuoensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a mountain lake, Sichuan Province, China, and a new morphology within the catch-all genus Platessa

Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China; Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China
Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China
Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China
Museum of Natural History and Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309 USA
Engineering Research Center of Environmental DNA and Ecological Water Health Assessment, Shanghai Ocean University, Shanghai 201306, China
China Lake Congqiancuo new species Platessa taxonomy Algae

Abstract

Platessa congqiancuoensis sp. nov., a new freshwater diatom from Lake Congqiancuo (Sichuan, China), is described using light and scanning electron microscopy. Diagnostic features include an elliptical-lanceolate valve outline, narrowly linear axial area, and a rhombic to oval central area bordered by 4–5 shortened striae. Striae transition radially from the valve center to convergent apices, with hooked terminal raphe ends deflected in opposite directions. The species is distinguished from morphologically similar taxa (P. mugecuoensis, P. stewartii, P. bahlsii, and P. brevicostata) by valve dimensions, shape, striae density, and ultrastructural details. We further contextualize Platessa within related genera and discuss potential taxonomic linkages.

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How to Cite

Zhang, W., Zheng, Y., Yin, S., Kociolek, J.P. & Wang, N. (2025) Platessa congqiancuoensis sp. nov., a new freshwater diatom species (Bacillariophyceae) from a mountain lake, Sichuan Province, China, and a new morphology within the catch-all genus Platessa. Phytotaxa 722 (1): 29–40. https://doi.org/10.11646/phytotaxa.722.1.3