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Issue: Vol. 728 No. 3: 13 Nov. 2025
Type: Article
Published: 2025-11-13
DOI: 10.11646/phytotaxa.728.3.5
Page range: 294-300
Abstract views: 115
PDF downloaded: 4

New data on the stomatocyst of Spiniferomonas abrupta Y. Nielsen (Chrysophyceae, Chromulinales)

Limnological Institute, Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, Russia
Limnological Institute, Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, Russia
Limnological Institute, Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, Russia
Silica-scaled chrysophytes Spinifermonas stomatocysts scanning electron microscopy Algae

Abstract

Of the more than 800 stomatocyst morphotypes described in studies worldwide, about 36 morphotypes have been assigned to species of silica-scaled chrysophytes. Using scanning electron microscopy, we observed the formation of stomatocysts of the rare boreal species Spiniferomonas abrupta. Based on the presence of species-specific siliceous plate-scales on the surface, Stomatocyst 513 Firsova & Bessudova, its affiliation to S. abrupta was determined. The stomatocyst is primarily spherical or widely obovate, with an obconical collar and a regular pore surrounded by a flat planar annulus. This morphotype was found at the mouth of the Ida River, a right tributary of the Angara River, in Eastern Siberia, in May at a water temperature of 11.3 °C and pH 8.4.

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How to Cite

Bessudova, A., Firsova, A.D. & Likhoshway, Y.V. (2025) New data on the stomatocyst of Spiniferomonas abrupta Y. Nielsen (Chrysophyceae, Chromulinales). Phytotaxa 728 (3): 294–300. https://doi.org/10.11646/phytotaxa.728.3.5