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Difflugia difficilis
D. difficilis, (Naardermeer, Netherlands, 2019)

Difflugia difficilis Thomas, 1954

Diagnosis: Test ovoid, circular in cross-section. Aboral end of the test commonly with a not prominent, but rounded protuberance, sometimes replaced by a foreign body (diatom) which acts as the absent horn. The sides of the test converge towards the pseudostome to end in a short collar; the pseudostome is circular with a diameter varying between one-half and two-thirds of the width of the test. Test hyaline, clear, coated with siliceous particles, arranged regularly. Nucleus vesicular, spherical, with one central nucleolus and a more peripheral layer of granular material.

Dimensions: Length 83-93 µm; width 59-66 μm; pseudostome 20-27 µm; height of the collar, 6-9 μm. My measurements: L 80-117 µm; W 54-78 µm; pseudostome 26-32 µm; collar 4.7-7.4 µm high (n=6); nucleus 18.5-22.9 µm (n=2).

Ecology: Fresh water, sediment; France (1954), Belgium (Chardez, 1956), Africa (Gauthier-Lièvre et Thomas, 1958), the Netherlands (2019).

Difflugia difficilis
D. difficilis, after Thomas, 1954.
Difflugia difficilis
Difflugia difficilis
D. difficilis, nuclei
Difflugia difficilis
Difflugia difficilis
D. difficilis, nuclei
Difflugia difficilis
Difflugia difficilis
D. difficilis, with two horns (Naardermeer, Netherlands, 2019)
Difflugia difficilis
Difflugia difficilis
D. difficilis
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