Genus: Colony spherical in shape, consisting of 64 or 32 cells arranging at its perphery;
a large inner cavity present; each cell embedded within a gelatinous matrix;
four small asexual (somatic) cells located at the posterior end of the colony; with two flagella;
chloroplast cup-shaped; pyrenoids absent; stigma conspicous, located at anterior half of the cell body;
3 or 4 contractile vacoules anterior
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).