Cryptodifflugia horrida Page, 1966
Difflugiella horrida Schönborn, 1965
Diagnosis: Shell small, with length only slightly exceeding width, almost cylindrical, with broad aperture occupying almost entire lower side of the shell, shell surface covered by rare sand grains.
Dimensions: Shell length 13–17 μm, shell width 12–15 μm, aperture diameter 8–11 μm.
Ecology and distribution: In thickets of Typha in waterbodies. Bulgaria, Germany, Poland, Czech Republic, Spitsbergen, Vietnam.
Reference: 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.