Cryptodifflugia globosa Playfair, 1917
Basionym: Cryptodifflugia crenulata var. globosa Playfair, 1917

Diagnosis: Shell differing from the typical form by its globose to subglobose shape; aperture occupying the entire lower surface.

Dimensions: Shell length 17–20 μm; shell width 15–18 μm.

Ecology: In thickets of Typha in waterbodies.

Distribution: Australia; Poland; Germany; Greenland; Romania; Vietnam; South Georgia; Crozet Island; Possession Island.

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.

*) Taxonomic Note: Cryptodifflugia crenulata var. globosa Playfair, 1917, is changed to Cryptodifflugia globosa Playfair, 1917.
No new name needs to be established in this case under the International Code of Zoological Nomenclature. Because the name was published before 1961 using the abbreviation var., it is deemed subspecific under Article 45.6.4, unless explicitly proposed as infrasubspecific. As a species-group name, it is simultaneously established at both species and subspecies rank under the Principle of Coordination (Art. 46.1), with the same author, date, and name-bearing type. Accordingly, when treated at species rank, the correct name is Cryptodifflugia globosa Playfair, 1917.