Fottea 2025, 25(1):105-120 | DOI: 10.5507/fot.2024.011

Ultrastructure of Tryblionella qinghainensis sp. nov., T. apiculata and T. levidensis (Bacillariophyta) from Lake Qinghai (China), with reference to the marginal ridge

Yi-Dan Ma1, Bing Liu1*, Patrick Rioual2, 3, Ji-Yan Long4, Ya-Lun Ma1
1 College of Biology and Environmental Sciences, Jishou University, Jishou 416000, People's Republic of China; *Corresponding author e-mail: jsulb@outlook.com
2 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. box 9825, Beijing 100029, People's Republic of China
3 CAS Center for Excellence in Life and Paleoenvironment, Beijing 100044, People's Republic of China
4 School of Life Sciences, Nanjing Normal University, Nanjing 210000, People's Republic of China

Three Tryblionella species found at the same locality in Lake Qinghai, the largest inland saline water lake of China, are studied by using light and scanning electron microscope. One species is proposed as new to science and named Tryblionella qinghainensis sp. nov. The other two species are identified as T. apiculata W. Gregory and T. levidensis W. Smith. Tryblionella qinghainensis sp. nov. is characterized by its linear-lanceolate valve outline, broad axial sternum, a stria density to fibula density ratio of ca. 1.9:1, alveolate striae, and a simple standing lamella-like marginal ridge unperforated. Several ultrastructural details for T. apiculata and T. levidensis are revealed for the first time, especially the ultrastructure of their marginal ridges. The structure and shape of the marginal ridge in these three Tryblionella species are different, and the ultrastructure at the junction between the marginal ridge and the distal mantle can also vary for each individual species. The ultrastructure of the marginal ridge and distal mantle may be used as important diagnostic characters for the species of the genus Tryblionella.

Keywords: alveolate striae, distal mantle, marginal ridge, sternum, Tryblionella qinghainensis

Received: April 17, 2024; Revised: July 29, 2024; Accepted: October 18, 2024; Prepublished online: January 24, 2025; Published: April 1, 2025  Show citation

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Ma, Y., Liu, B., Rioual, P., Ji-Yan, L., & Ma, Y. (2025). Ultrastructure of Tryblionella qinghainensis sp. nov., T. apiculata and T. levidensis (Bacillariophyta) from Lake Qinghai (China), with reference to the marginal ridge. Fottea, 25(1), 105-120. doi: 10.5507/fot.2024.011
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