Hyalosphenia tamdaoensis Balik, 1995

Diagnose. Shell bilaterally symmetrical, long, narrow ovoid-, egg-, or vase-shaped; in cross section, bean- or kidney-shaped. “Dorsal” side vaulted, “ventral” side depressed, depression elliptical. Shell organic, with a relatively robust test wall, and smooth surface. Lateral pores absent. Shell pellucid, translucent, light yellow or yellowish-orange. Pseudostome small, elliptical in frontal view, with a thick organic rim.

Dimensions: According to Balik (1995): Shell length 107–115 μm; width 31–36 μm; aperture 9–11 μm.

Ecology: Rainforest leaf litter.

Geographical distribution: Vietnam.

References: Kosakyan, A., Meisterfeld, R., Lara, E., Duckert, C., Mitchell, E., 2025. A taxonomic monograph of hyalospheniid testate amoebae. Amoebozoa: Arcellinida: Hyalospheniformes, Mémoire XIV. Éditions Alphil-Presses universitaires suisses, Neuchâtel.