Difflugia conicollis  Gassowsky, 1936

Diagnosis: Shell ovoid, with a wide end facing upward, the sharp end of which is cut off perpendicular to the longitudinal axis and then expanded downwards, forming a wide conical collar. Due to this, the outer diameter of the apertural end is only slightly smaller than the largest diameter, while the narrowed part, the neck of the collar, has a diameter one and a half times smaller compared to the largest diameter of the shell. Shell is covered with particles of detritus tightly adjacent to each other with an admixture of tiny mineral particles, almost completely opaque, but the color is gray-brownish brown. Cytoplasm fills the shell almost completely, leaving only a small free space at its apical end. When moving, the cytoplasm forms one or two short, more or less conical, widely rounded at the end, quickly iridescent lobopodia.

Dimensions: Gassowsky (1936): Shell length 26-40 um, collar height 3.6-5.0 µm; largest shell diameter 19-30 um; diameter narrowed neck, 12-21 µm; largest diameter of the collar 17-26 µm.

Habitat: Freshwater, Lake Onega, Russia.