Cyclopyxis acmodonta Nicholls, 2005

Diagnosis. Shell constructed of agglutinated microscopic quartz granules and in side view with a flattened ventral surface and domed dorsal surface. Ventral surface with a centrally located and irregularlyshaped oral aperture (pseudostome) about 1/2 the shell diameter and composed of from 3—7 lobes or indentations. Margin of the pseudostome ornamented with many sharp-pointed tooth-like granules. Pseudostome only slightly invaginated relative to the surrounding ventral surface of the test.

Dimensions: According to Nicholls (2005): Shell diameter 188—298 µm; height 150—217 µm; diameter of aperture 75—143 µm.

Ecology: Forest bog (Sphagnum moss dominated small pool).

Geographical distribution: Near the upper Beaver River, Ontario Canada.