Cyclopyxis aplanata (Penard, 1911) Deflandre, 1929
Diagnosis: The shell is large, flattened in profile, the transition of the dorsal side to the ventral rounded, the dorsal side arcuately curved. The mouth is central, rounded, the contour is slightly irregular.
Dimensions: Diameter of test: 187-209 µm.
Ecology: Freshwater, river in Sierra Leone, Africa.
Remarks: Van Oye (1936) describes C. aplanata var. minima, which differs from the typical form by a much smaller size: 22.5 µm.