Cyclopyxis acmodonta Nicholls, 2005
Diagnosis: Test 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 test diameter and composed of from three to seven 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: Diameter of shell 188-298 µm; height of shell 150-217 µm; diameter of aperture 75-143 µm.
Ecology: Forest bog (Sphagnum moss dominated small pool) near the upper Beaver River, Ontario Canada.