Arcella brasiliensis  Cunha, 1913

Diagnosis: Shell circular in apertural view, hemispherical in lateral view, with a distinct marginal rim. Dorsal surface provided with depressions, promoting an undulate aspect. Aperture circular, central, invaginated, delimited by a curled lip.

Dimensions: Cunha (1913): Shell diameter about 80 µm.

Ecology: Between aquatic mosses and on aquatic plants,

Geographical distribution: Brasil; South-America.