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Issue: Vol. 774 No. 3: 17 Sept. 2026
Type: Article
Published: 2026-09-17
DOI: 10.11646/phytotaxa.774.3.8
Page range: 281-288
Abstract views: 21
PDF downloaded: 0

Additional morphological studies of Mallomonas lusca (Synurales, Chrysophyceae) and a description of a new species Mallomonas lunaris sp. nov.

Institute for Cellular and Intracellular Symbiosis; Orenburg Federal Research Center; Ural Branch; Russian Academy of Sciences; Pionerskaya Street 11; 460000; Orenburg; Russia
Severtsov Institute of Ecology and Evolution; Russian Academy of Sciences; Leninsky Prospect 33; 119071 Moscow; Russia
Coastal Branch of Joint Viet Nam-Russia Tropical Science and Technology Research Center; 30 Nguyen Thien Thuat; Nha Trang 650000; Vietnam
Algae Mallomonas new species scale ultrastructure section Torquatae Vietnam

Abstract

A new species, Mallomonas lunaris sp. nov., is described from Vietnam based on silica-scale morphology studied using scanning and transmission electron microscopy. Mallomonas lunaris belongs to section Torquatae and is most similar to M. lusca. Its scales have 4–9 conspicuous rounded pits, each surrounded by a rim with delicate papillae. These pits are located at the angle of the posterior submarginal rib, along the posterior submarginal rib, and near the anterior submarginal rib. Mallomonas lunaris has been observed in two localities in Vietnam. Additional studies of the ultrastructure of the scales of Mallomonas lusca were conducted. They showed that on the scale shield, up to two pits with an internal elevation (“island”) can be formed in addition to the pit in the angle of the posterior submarginal rib.

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How to Cite

Ignatenko, M.E., Gusev, E.S. & Huan, P.T. (2026) Additional morphological studies of Mallomonas lusca (Synurales, Chrysophyceae) and a description of a new species Mallomonas lunaris sp. nov.. Phytotaxa 774 (3): 281–288. https://doi.org/10.11646/phytotaxa.774.3.8