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).
This species might be identical with D. mammillaris.

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

Recent posts

Cryptodifflugia collum

Cryptodifflugia collum, after Chardez, 1971 Cryptodifflugia collum  (Chardez, 1971) Bobrov et Mazei, 2017 Difflugiella collum Chardez, 1971 Diagnosis: Shell globose, transparent, hyaline, chitinous, aperture topped

Read More »

Cryptodifflugia brevicolla

Cryptodifflugia brevicolla, after Golemansky, 1979 Cryptodifflugia brevicolla  Golemansky, 1979 Diagnosis: Shell ovate, laterally compressed, with clearly expressed chitinous collar around an aperture, neck circular in

Read More »

Cryptodifflugia bassini

Cryptodifflugia bassini, after Bobrov, 2001 Cryptodifflugia bassini  Bobrov, 2001 Diagnosis: Shell small, axially symmetrical, circular in transverse section, flattened in longitudinal section, widely elliptical. Aperture

Read More »

Cryptodifflugia apiculata

Cryptodifflugia apiculata, after Cash, 1904 Cryptodifflugia apiculata  (Cash, 1904) Page, 1966 Difflugiella apiculata  Cash, 1904 Diagnosis: Shell ovoid, not compressed laterally, chitinous, smooth, transparent, colorless,

Read More »

Cryptodifflugia angusta

Cryptodifflugia angusta, after Schönborn, 1965 Cryptodifflugia angusta  (Schönborn, 1965) Page, 1966 Difflugiella angusta  Schönborn, 1965 Diagnosis: Shell small, organic, elongated-ovate, not transparent, yellow-brown, covered with

Read More »

Cryptodifflugia angulata

Cryptodifflugia angulata, after Playfair Cryptodifflugia angulata Playfair, 1917 Diagnosis: Shell small, oval, transparent, lateral sides flattened, fundus rounded-conic, widest shell part in the middle, lateral

Read More »