Cryptodifflugia vulgaris  (Francé, 1913) Volz, 1928
Difflugiella vulgaris Francé, 1913

Diagnosis: Shell globose or somewhat oval, rather thick-walled, transparent, structureless. One end with very small circular aperture surrounded by thickened wall. Sometimes there occur yellowish and brownish to dark brown specimens.

Dimensions: Shell length 15–18 μm, shell width 10–21 μm, aperture diameter 3.8–4.5 μm.

Ecology and distribution. Soils, common in forest litter, sometimes in rhizosphere, once recorded in Sphagnum. Germany, Bulgaria. Russia.

Remarks: This species is probably identical with C. oviformis.

References: 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.