Cryptodifflugia crenulata globosa Playfair, 1917
Diagnosis: Shell differs from the typical form by the globose or subglobose shell shape; aperture occupies the entire lower surface.
Dimensions: Shell length 17–20 μm, shell width 15–18 μm.
Ecology and distribution: In thickets of Typha in waterbodies. Australia, Poland, Germany, Greenland, Romania, Vietnam, South Georgia, Crozet and Possession Island.
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.