Difflugia lemani
 
D. lemani 198-202 µm, Tirol, Austria

 
Difflugia lemani Blanc, 1892

Syn.: Difflugia viscidicula Penard, 1902 pars

Diagnosis: Shell elongated oblong, not compressed, resembling an acorn, without distinct neck. Nucleus large, with a distinct membrane and filled with a large number of nucleoli, rounded or amorphous, but mostly flattened.

Dimensions: Blanc (1892): 180-310 µm; Penard (1902): 180-260 µm; my measurements length: 183-211 µm.

Ecology: Freshwater; Switzerland; Tirol, Austria, the Netherlands (Naardermeer and several other locations).

Remarks: Penard described this species in 1902 as D. viscidicula, 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. However, his figure 3, see below, is quite different from the other two tests. It has a distinct neck and is much more elongated. I consider this as a different species with the name D. viscidula.

Penard describes the shape as that of an acorn.

Difflugia viscidula
Drawing: Penard (1902) in Faune Rhizopodique du Bassin du Léman
Difflugia lemani
Difflugia lemani
Difflugia lemani, from Penard, 1905
Difflugia lemani
Difflugia lemani, 185 an 211 µm (Netherlands) and 183 µm (Austria, r.)

     

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