Cyclopyxis ghesquierei  Kufferath, 1932
Basionym: Cyclopyxis arcelloides var. ghesquierei  Kufferath, 1932*

Diagnosis: This species differs from C. arcelloides in its larger half‑diameter of 49–58 µm. The central, rounded pseudostome measures 24–28 µm in diameter. The shell is hemispherical, with a height of 24–31 µm (approximately half the diameter). It is colourless to brownish and encrusted with small, protruding mineral grains.

Dimensions: According to Kufferath (1932): shell diameter 49–58 µm; height 24–31 µm; pseudostome diameter 24–28 µm.

Ecology: Freshwater.

Geographical distribution: Recorded from Barumbu, near Kinshasa, Democratic Republic of the Congo.

*) Taxonomic note. Cyclopyxis arcelloides var. ghesquierei  Kufferath, 1932 is correctly treated as Cyclopyxis ghesquierei Kufferath, 1932.
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 Cyclopyxis ghesquierei Kufferath, 1932.