Cryptodifflugia brevicolla  Golemansky, 1979

Diagnosis: Shell ovate, laterally compressed, with a clearly expressed chitinous collar around the aperture; neck circular in transverse section; fundus elliptical in transverse section; shell colorless and transparent. Aperture circular, surrounded by a small transparent chitinous collar.

Dimensions: Shell height 14–18 μm; shell width 12–15 μm; shell depth 5–11 μm; aperture diameter 4–7 μm.

Ecology:  Marine sandy beach, psammal supralittoral.

Distribution: Vietnam.

References: Bobrov, A., Mazei, Y., 2017. A review of testate amoeba genus Cryptodifflugia Penard, 1890 (Phryganellina: Cryptodifflugiidae) with a key to species. Zootaxa 4282 (2): 292–308.