Cryptodifflugia horrida  Page, 1966
Syn.: Difflugiella horrida Schönborn, 1965

Diagnosis: Shell small, with length only slightly exceeding width; almost cylindrical; aperture broad, occupying almost the entire lower side of the shell; shell surface covered with sparse sand grains.

Dimensions: Shell length 13–17 μm; width 12–15 μm; aperture diameter 8–11 μm.

Ecology: In thickets of Typha in waterbodies.

Distribution: Bulgaria; Germany; Poland; Czech Republic; Spitsbergen; 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.