Genera of family “Clade C2”


Test monothalamous, almost spherical, 140–450 mm in diameter; wall transparent, proteinaceous, with smooth outer surface devoid of agglutinated grains; single aperture located in the centre of low, broad projecting region; cytoplasm light grey or greenish, containing various inclusions which often include mineral particles.


Test elongate ovate to sausage-shaped, up to 2mm in length. Wall of two more or less separated proteinaceous membranes, single aperture, cytoplasm with numerous inclusions.