Difflugia ventricosa Deflandre, 1926
Diagnosis: Test thin elongated, slightly expanding from the pseudostome to the base of the fundus, but then abruptly turning into a sharp spike. Constructed from different sizes of sand grains, diatom frustules, flagellates cysts. The surface is uneven. The pseudostome is rounded, surrounded by small mineral grains.
Dimensions: Length 160–200 µm, width 55–70 µm, diameter pseudostome 25–31 µm.