Cyclopyxis eurystoma
Cyclopyxis acmodonta from Nicholls, 2005

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. Test diameter, 188-298 µm; test height, 150-217 µm; widest opening in pseudostome (between distal lobes), 75-143 µm. 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.

Remarks:

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