Genus:
Cell body slightly assymmetrical, prolate ellipsoidal or nearly cylindrical in shape;
both ends rounded; horizontal (slightly slanted) depression present at anterior end;
a single flagella emerging from the depression nearly vertically to longitudinal axis of the cell body;
"pro-basal body" present (?); cell body covered by a layer of submicroscopic scales;
chloroplast essentially cup-shaped, but deeply incised forming two lateral lobes; each lobe with a
pyrenoid; stigma posterior or absent; nucleus at anterior half of the cell body;
one or two contractile vacuoles apical; 1-7 trichocysts (up to 5 μm long)
present at posterior, arranging longitudinally
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).