| Summary: | FIGURES 5–11. Scales of Mallomonas sibirica sp. nov. from different types of habitats. Figure 5. Body scales with subcircular and smooth dome, evenly spaced transverse ribs and rounded depressions between them. The posterior rim, wide and smooth, bears numerous internal struts. The posterior flange has struts and scattered rounded depressions in the base plate that are not evenly spaced, from Lake Baikal, TEM. Figure 6. Body scale from the type habitat, Lake Ulu, SEM. Figures 7. Body scale, the dome is subcircular, ornamented with struts, undersurface view of the scales, from Lake Labynkyr, SEM. Figures 8. Body scale, the dome is subcircular patterned with rounded depressions, from Lake Labynkyr, SEM. Figure 9. Body scale, from a mixing zone of the Yenisei River and the Kara Sea waters, SEM. Figures 10–11. Body scale, undersurface view of the scales, from Lake Labynkyr, SEM. Scale bars: 2 μm. Published as part of Bessudova, Anna, Firsova, Alena D., Tomberg, Irina V., Bayramova, Elvira, Hilkhanova, Diana, Bedoshvili, Yekaterina D., Bashenkhaeva, Maria, Zakharova, Lyubov I. Kopyrina Yulia R. & Likhoshway, Yelena V., 2023, Two new species of silica-scaled chrysophytes (Chrysophyceae, Synurales) Mallomonas kicherica and M. sibirica water bodies of Eastern Siberia, Russia, pp. 59-69 in Phytotaxa 620 (1) on page 64, DOI:10.11646/phytotaxa.620.1.5, http://zenodo.org/record/10015521
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