A review of testate amoeba genus Cryptodifflugia Penard, 1890 (Phryganellina: Cryptodifflugiidae) with a key to species Author Bobrov, Anatoly Author Mazei, Yuri text Zootaxa 2017 4282 2 292 308 journal article 28745 10.11646/zootaxa.4282.2.4 8265bc1a-8903-47d1-a59d-218d749895e5 1175-5326 818668 CB1CD0B8-797B-4F2D-B100-C12E20AA092E C. oviformis Penard, 1890 Figs 5 g, 5h, 5i , 5j, 5k Difflugiella oviformis in Bonnet et Thomas, 1955 ; Cryptodifflugia operculata Page, 1966 Original description. Penard 1890 , P. 168, Table 7, Figs 95–107. Description. Shell colorless, oval, with smooth surface, the shell wall is composed of two layers, a thin outer covering of organic material and a thick inner layer of amorphous calcium phosphate, the aperture is terminal, circular and bordered by a small organic collar. Measurements. Shell length 13–26 µm, shell width 8.0–20.7 µm, diameter of aperture 3.0–6.9 µm. Habitat. Freshwater sediments, Sphagnum mosses, wet green mosses, aquatic plants, acid soil. Geographical distribution. Cosmopolitan.