D. foissneri - from Chardez, 1987

 

 

Difflugia foissneri Chardez, 1987

 

Diagnosis: Test compact, massive, oval in cross section, in side view strongly compressed towards the fundus; flanks converging towards a more or less circular pseudostome; fundus with three, sometimes two, regular triangular horns and regularly spaced. These horns are always placed in the same plane. Test covered with transparent mineral platelets, which slightly overlap each other; pseudostome surrounded by the same plates forming a collarless jagged edge. Cytoplasm clear, finely punctuated, like pseudopodia. Usually one lobopodium. One spherical nucleus, 30 µm in diameter.

 

Dimensions: Height 210-230 µm, width 170-180 µm, thickness 90-100 µm, diameter pseudostome 86-90 µm, horns 19-21 µm long.

 

Ecology: Sediment from the bottom of large lakes (Virelles, Hainaut, Epioux, Ardennes, Belgium).

 

Remarks: Difflugia foissneri is probably identical with D. bidens Penard, 1902