Difflugia varians
Difflugia varians, 94 µm high, with four spines

 

 

Difflugia varians Penard, 1902

 

Diagnosis: shell usually yellowish to brown, covered with small mineral grains and diatom fragments, embedded in an organic cement. Shape elongated ovoid, very irregular, somewhat compressed, fundus usually with one to three, sometimes four conical horns with broad base, but these horns are not always present; nucleus vesicular with one central nucleolus.

 

Dimensions: Penard gives as mean 100-125 µm. My measurements 94-160 µm.

 

Ecology: Waterplants and sediment of ditches and peat bogs, Haaksbergen, Naardermeer and Crailoo.

 

Remarks: A very remarkable and extremely variable species which is rather rare. I have found it on three locations in the Netherlands, but Hoogenraad & De Groot (1940) have never recorded this species.

 

Difflugia varians
Difflugia varians
Difflugia varians
Pseudopodia and to the right shell: 140 µm incl. spines
Difflugia varians
Difflugia varians
Five spines, 88 µm
Difflugia varians
Difflugia varians
Difflugia varians
Difflugia varians
Drawing: Penard (1902) in Faune Rhizopodique du Bassin du Léman
Shell attached to the cover glass, 140 µm
Difflugia varians
Difflugia varians with two horns
Difflugia varians
Difflugia varians, very irregularly shaped
Difflugia varians
Difflugia varians
Difflugia varians
Difflugia varians, two shells from the same sample as the other ones on this page.
Difflugia varians
Difflugia varians
Shell with five horns