Difflugia acutissimella Chardez, 1985
Diagnosis: Test elongated, bulbous, circular in cross section, with a right truncated pseudostome; largest diameter of the test is at one third from the pseudostome, then the flanks gradually accumulate to form a caudal extension, with a more or less thick closed-end and rounded, sometimes slightly curved. Test build entirely of small flat quartz grains, regularly stored around the pseudostome; these xenosomes are embedded in a hyaline to yellowish organic cement.
Dimensions: Chardez: height 100-126 μm; diameter 46-58 μm; pseudostomal diameter 22-24 μm.
Ecology: Fresh water, sediment Lake Virelles, Belgium.
Remarks: The fourth test of the images published by Chardez (1985) differs strongly from the other ones. It resembles much more a small D. longum, which was also present in the same lake (Chardez, 1987).
Chardez, D.: Contribution à la connaissance des Thécamoebiens des dépôts lacustres - Acta Protozool. 26: 1, 59-62 (1987)