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Difflugia sp.
D. viscidula, 198-202 µm, Tirol, Austria

Difflugia viscidula Penard, 1902
Synonym: Difflugia lemani Blanc, 1892

Diagnosis: Shell ovoid to slightly elongated oblong, circular in cross section, with rounded fundus; without a constriction between body and neck; neck, if distinct, short and composed of much smaller particles than the rest of the shell;  neck sometimes with concave sides, like a vase. Shell composed of a mixture of small and large pieces of quartz, rarely with diatom frustules. Aperture circular, with regular outline, surrounded by small particles. Cytoplasm does not fill the whole shell, usually with brown granules; sometimes with zoochlorellae. One large ovular nucleus with many small nucleoli. Pseudopodia few, short, thin, very slow moving, rarely visible.

Dimensions: Penard (1902): 180-260 µm. Todorov and Bankov (2019): 200-267 µm. My measurements 189-202 µm.

Ecology: Freshwater, Sphagnum; cosmopolitan.

Remarks: Penard described this species in 1902 as D. viscidula, but in 1905 he wrote that he had made a mistake by which he thought that D. lemani was a much smaller species. He noticed erroneously 31-80 µm, instead of 180-310 µm, as given by Blanc (1892).

Difflugia viscidula
Drawing: Penard (1902) in Faune Rhizopodique du Bassin du Léman. In 1905 he wrote that this should be D. lemani Blanc 1892.
Difflugia viscidula
D. viscidula, aperture
Difflugia viscidula
D. viscidula, with adhering debris – stacked image, Tirol, Austria
Difflugia viscidula
D. viscidula, shell 183 µm
Difflugia viscidula
D. viscidula, Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
D. viscidula, Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
Sometimes large part of cytoplasm protrude out from the aperture forming flattened, fan-shaped disc with short pseudopodia, adhered to the substrate (Todorov and Bankov, 2019). Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
D. viscidula, Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
D. viscidula, Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
D. viscidula, Bulgaria (Photomicrograph Milcho Todorov)
Difflugia viscidula
Difflugia viscidula, Bulgaria (Photomicrograph Milcho Todorov)
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