Genus Antarcella Deflandre, 1928, emend. 1953
Diagnosis: Test in lateral view hemispherical; aperture circular, invaginated. In contrast to Arcella, Antarcella has one ovular nucleus. Contractile vacuole 10 to 15 µm.
Ecology: herbivorous. Habitat: sphagnum mosses (A. pseudarcella), brackish water (A. atava).
Two species. Refs: Collin (1914), Deflandre (1928a).
Type species: Antarcella atava (Collin, 1914).
NOTE: To distinguish Antarcella species from Arcella spp., staining of the nucleus is recommended.