Commation cryoporinum is a species of heterotrophic protists discovered in 1993 in Antarctic waters.

The name of the genus derives from Latin comma, which references the general biconvex shape of the cell.

[1] Commation cryoporinum is a species of unicellular eukaryotes composed of oval cells measuring 7–14 × 5–8 μm.

Their complex cytoskeleton is dominated by microtubular components, not conspicuous under light microscopy.

In contrast, C. eposianum only presents one type of extrusomes which is never visible under light microscopy.