Genus Cryptodifflugia Penard, 1890
Diagnosis: Shell oval, egg-shaped, pyriform with a short neck, circular or oval cross-section, with adhering foreign particles or smooth surface, colorless, yellow or brown, composed of an outer proteinaceous material usually lined, aperture terminal, circular or oval. Pseudopods are in the form of ectoplasmic anastomosing reticulolobopods.
Type species: Cryptodifflugia oviformis Penard, 1890.
Ecology: Fresh water, soil and mosses.
Key to the species
After Bobrov and Mazei, 2017