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Difflugia globulosa
Difflugia globulosa, 70 µm, stacked image

Difflugia globulosa (Dujardin, 1837) Penard, 1902  – Small species

Diagnosis: Shell light to dark brown, spherical, composed of small and large quartz particles but may also include diatom frustules, fungal spores and hyphen and other debris; general appearance rough; aperture broad and circular, surrounded by smaller particles which form a more or less thickened collar. Pseudopodia lobose. Nucleus not observed.

Dimensions: Diameter of the shell 61-70 µm (n=10); height 66-72 µm; aperture 32 µm, half the diameter of the shell.

Ecology: Peatbog, between wet sphagnum; Naardermeer, the Netherlands, 2019.

Remarks: This species thrived well in a wet mount kept in a moist chamber for some weeks. It multiplied relatively fast, but it is a very slow moving species. I’ve never seen it moving, but if I looked at the wet mount from time to time I could see that they had moved.
This species resembles one of the forms described by Penard (1902) who described D. globulosa as having two distinct forms, the typical form and one varying between 135 and 155 µm and two smaller forms 50 to 70 µm in size.

Difflugia globulosa
Difflugia globulosa, stacked image
Difflugia globulosa
Difflugia globulosa, with pseudopodia
Difflugia globulosa
Stacked image showing the thicked border (below) around the aperture.
Difflugia globulosa
Difflugia globulosa, division
Difflugia globulosa
Difflugia globulosa, living specimen
Ferry Siemensma, created April 14, 2019; last modified January 31, 2021
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