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Issue: Vol. 749 No. 1: 25 Mar. 2026
Type: Article
Published: 2026-03-25
DOI: 10.11646/phytotaxa.749.1.3
Page range: 51-65
Abstract views: 0
PDF downloaded: 0

Tryblionella chongmingensis sp. nov. (Bacillariophyceae), a new diatom species from Chongming Island, Shanghai, China

Key laboratory of Exploration and Utilization of Aquatic Genetic Resources of the 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
Key laboratory of Exploration and Utilization of Aquatic Genetic Resources of the 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
Shanghai Academy of Environmental Sciences, Shanghai 201306, China
University of Lodz, Faculty of Biology and Environmental Protection, Department of Algology and Mycology, ul. Banacha 12/16, 90-237 Łódź, Poland
Key laboratory of Exploration and Utilization of Aquatic Genetic Resources of the 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
taxonomy new species ultrastructure epiphyton Nanheng Diversion Canal Algae

Abstract

In this study, we describe a new epiphytic diatom species, Tryblionella chongmingensis sp. nov., discovered in the Nanheng Diversion Canal and surrounding small waterways on Chongming Island, Shanghai, China. Observations using light and scanning electron microscopy reveal key morphological features: longitudinal valve undulation with its lowest point on the proximal side and the absence of an axial sternum served as the diagnostic basis for its placement within the aphyletic group. The species is characterized by a relatively large cell size and is distinguished from similar taxa by distinct traits: the presence of a central nodule and valve constriction compared to T. rabenhorstii; the absence of a marginal ridge and reticulate thickenings on the axial sternum compared to T. plana var. fennica; and unique mantle poration (with three types) and pronounced grooves compared to T. scalaris. Ecologically, T. chongmingensis exhibits moderate halotolerance, aligning with the brackish preferences of other Tryblionella species, suggesting its potential as an indicator for brackish waters.

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How to Cite

Liu, T., Feng, H., Wang, Q., Olszyński, R.M. & Zhang, W. (2026) Tryblionella chongmingensis sp. nov. (Bacillariophyceae), a new diatom species from Chongming Island, Shanghai, China. Phytotaxa 749 (1): 51–65. https://doi.org/10.11646/phytotaxa.749.1.3