Cryptodifflugia ovata  Playfair, 1917 *)
Basionym: Cryptodifflugia compressa var. ovata  Playfair, 1917

Diagnosis: Shell differing from the typical form by its more elongated and broadly ovate shape, and by the absence of an organic lip around the aperture.

Dimensions: Shell length 19 μm; shell width 17–18 μm.

Ecology: On aquatic plants and in wetlands.

Distribution: Australia.

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 compressa var. ovata is changed to Cryptodifflugia ovata Playfair, 1917. A formal change is not required in this case according to the International Code of Zoological Nomenclature:
(1) According to article 45.6.3, as the name was published before 1961 using the abbreviation var., it is deemed to be subspecific rather than infra-subspecific and therefore falls under rulings for species-group nominal taxa (Chapter 10).
(2) According to article 46.1, names established at either species ranks (species or subspecies) are simultaneously established at the other rank, with same author and same type. Authority thus is unchanged.