Description: Shell small, bilaterally symmetrical, ovate, rather wide in plane, flattened, colorless, transparent. Dorsal side convex, posterior end shifted to ventral side. Aperture elliptical, subterminal, anterior end with the aperture curved towards ventral side. Shell surface smooth, without mineral inclusions (Figs 4, 5). Measurements: Shell length 6.00–10.50 μm; shell breadth 4.00–7.75 μm; shell depth 4.00–5.00 μm; axis of aperture 3.25–4.25 μm. Type locality: Polygonal tundra, 28 km northwestward of Chokurdakh settlement (Yakutia). 70°49′55.4″N 147°28′39.1″E. Biotope: Sphagnum, peat tussock, microelevation in the center of the testing area. Vegetation: Carex chordorrhiza, Andromeda polifolia, Salix myrtilloides, Ledum decumbens, Carex stans, Polytrichum commune, Sphagnum sp. Soil – Sphagnic Fibristel (US ST). Type specimen: Laboratory of Soil Bioindication, Department of Soil Geography, Faculty of Soil Science, Lomonosov Moscow State University, slide No. 2-2015.