Genus: Unicellular or colonial within a gelatinous sheath; planktonic; cell body spherical; 1 or several chloroplasts cup-shaped, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Similar genus -->
?), cell body nearly spherical,
μm in diam., x 640, Furu-tone river, Kasukabe city, Saitama Pref., Japan, February 15, 2004 by Y. Tsukii
94 μm; x 640
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