Centropyxis carinata Chardez, 1964

Diagnosis: Shell in ventral view circular, ventral side perfectly flat; aperture slightly eccentric, circular or oval, with strong and abrupt invagination. No internal bridges. Dorsal surface regularly domed, merging into a flat edge surrounding the whole test, anteriorly somewhat smaller than posteriorly. Shell yellow-brownish, green or orange, chitinous, finely granulated and embedded with small polymorph xenosomes. The edge is very clear, often transparent and almost exclusively built of diatom frustules.

Dimensions: Diameter 180-220 µm, height 50-55 µm.

Habitat: Freshwater, Congo-Kinshasa, Soudan.