Ehrenberg, 1832
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Cryptomorph 25–38 μm long × 15–18 μm wide × 13–16 μm thick (minimal and maximal mean values of strains); no pyrenoids; straight furrow widens drop-like at its distal end; furrow-gullet system lined by prominent ejectosomes; cells flattened in dorso-ventral plane, in broad view ovoid but with asymmetrical apex (shifted to the left) and antapex (shifted to the right); plastid margins extend longitudinally from apex to antapex; cells biconvex in right or left lateral view sometimes with flattened ventral side, antapex rounded. Campylomorph not known. (по: Hoef-Emden, Melkonian, 2003)