Cryptodifflugia collum  (Chardez, 1971)
Syn.:Difflugiella collum Chardez, 1971

Diagnosis: Shell globose, transparent, hyaline, chitinous; aperture topped with a rather broad cylindrical neck.

Dimensions: Shell length 16–18 μm, shell width 13–14 μm, aperture diameter 5–6 μm.

Ecology: Soil at a distance of about 10 meter from a freshwater swamp.

Distribution: Belgium, France.

Reference: Bobrov, A., Mazei, Y., 2017. A review of testate amoeba genus Cryptodifflugia Penard, 1890 (Phryganellina: Cryptodifflugiidae) with a key to species. Zootaxa 4282 (2): 292–308.