Cryptodifflugia conica  Playfair, 1917
Basionym: Cryptodifflugia pusilla var. conica Playfair, 1917

Diagnosis: Differs from the typical form by its more elongated shape. Shell conical or broadly oval, with a rounded aboral region. Apertural side equal in width to the shell.

Dimensions: Playfair (1917): shell length 12 μm; shell width 10 μm.
Own measurements (Odenwald, Germany): length 7.7–11.3 μm.

Ecology: Freshwater; on vegetation.

Distribution: Australia (Playfair (1917); Germany (Siemensma, unpublished).

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 pusilla var. conica Playfair, 1917, is changed to Cryptodifflugia conica 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 the rulings for species-group nominal taxa (Chapter 10).
(2) According to Article 46.1, names established at either species rank (species or subspecies) are simultaneously established at the other rank, with the same author and the same type. The authority thus remains unchanged.