Arcella grospietschi  Stepanek, 1963

Diagnosis: Shell disc-shaped, yellow-brown, in ventral view with a undulated border, with seven large and seven smaller lobes. Near the aperture, the wall changes into a thinner, skin-like enclosure that is bent back into the interior of the shell. This collar or enclosure is also flap-like, but not as clear as the border of the shell. The edge of the collar is yellowish, not very transparent.

Dimensions: According to Stepanek (1963): Shell diameter 132—146 µm; height 28 µm; aperture 35—42 µm.

Habitat: Freshwater.

Geographical distribution: Central Africa.

Remarks: Stepanek (1963): “Two shells were found with the plasma, unfortunately after fixation these lost their original shape. Nevertheless, two nuclei and some larger vacuoles were found. A total of 5 shells were found in two locations that were rather far apart from one another, but with the same geographical latitude.”