Genus: Cell body similar to Chloromonas, ellipsoidal, ovoid, cylindrical, or spherical in shape; cellwall thick; one or two gelatinous sheath present; papilla mostly distinct, domed or rounded (sometimes with tubular structures, flagella emerging from such tubes); chloroplast cup-shaped or perforated; pyrenoids absent; stimga mostly present; two apical contractile vacuoles present; two flagella emerging from different remote points on apical cell surface; nucleus at/near the center of the cell body (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983). Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.3, Iyari marsh, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii