Cryptodifflugia compressa var. glabra   (Schönborn, 1965)
Basionym: Difflugiella crenulata var. glabra Schönborn, 1965

Diagnosis: Shell differing from the typical form by the absence of excavations on the shell surface.

Dimensions: Shell length 15 μm; width 11–14 μm; aperture diameter 4 μm.

Ecology: Freshwater; recorded on Typha.

Distribution: Germany; Poland.

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.