Description of a new species Mallomonas limbata sp. nov. (Synurales, Chrysophyceae) from water bodies of Vietnam

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A new species Mallomonas limbata sp. nov. is described from Vietnam. The description is based on silica-scale morphology studied by means TEM and SEM. The species belongs to the section Planae and has a similar morphology with species from the Mallomonas matvienkoae complex. New species has ovoid scales, narrowed distally, a developed secondary siliceous layer with internal reticulation having rounded meshes, occupying up to 4/5 of the scale surface, with numerous papillae on the surface. Scales of M. limbata were found at twenty-six localities in nine provinces of Vietnam. The distributions and habitat conditions of the new species are summarized.

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Sobre autores

T. Safronova

Komarov Botanical Institute of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: safronova.tania@mail.ru
Rússia, St.-Petersburg

E. Gusev

Severtsov Institute of Ecology and Evolution оf the Russian Academy of Sciences

Email: safronova.tania@mail.ru
Rússia, Moscow

L. Nguyen Thi

Joint Vietnam-Russia Tropical Science and Technology Research Center

Email: safronova.tania@mail.ru

Coastal Branch

Vietnã, Nha Trang

Bibliografia

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2. Fig. 1. Map-scheme of the studied provinces of Vietnam. The studied provinces are marked with arrows.

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3. Fig. 2. Images of Mallomonas limbata sp. nov. scales, illustrating diagnostic features studied using TEM and SEM: a — SEM, the arrow indicates the thickened antherial edge; b — SEM, the arrow indicates the hyaline area along the antherial edge; c — TEM; g — TEM; d — TEM; e — TEM, the arrow indicates the central pore surrounded by a “cloud” of small pores; g — SEM; h — TEM, the arrow indicates the central pore surrounded by a “cloud” of small pores; i — TEM; j — TEM. Scale bar: a, b — 1 μm; c–f, h–j — 2 μm, g — 0.5 μm.

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