difflugia-acutissimella-Chardez

 

Difflugia acutissimella, from Chardez (1985); test X is obviously D. longum, in 1987 described by the same author and also found in the same lake.

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). 

Literature

Chardez, D.: Contribution à la connaissance des Thécamoebiens des dépôts lacustres – Acta Protozool. 26: 1, 59-62 (1987)

 

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