Genus: Solitary or colonial; body surface delicate; one to two chloroplasts; usually with a stigma; fresh water (Kudo, 1966). One to several chloroplasts; pyrenoid and/or eyespot (stigma) in some; cells naked, globular, ellipsoidal or pyriform (Illustrated Guide, 1985).
Species:

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O. variabilis 7 μm φ 2 chl. Omiya Saitama, 2000	O. variabilis stock Ikk, axenic 2 chl. ? Kaga Ishikawa, 2000	O. variabilis stock Ikk, axenic 2 chl. ? Kaga Ishikawa, 2000	O. variabilis μm φ 2 chl. ? Japan, 1999
O. variabilis cell μm Japan, 1998	O. variabilis μm φ 2 chl. ? Chiyoda-ku Tokyo, 2003	O. variabilis μm φ 2 chl. ? Ina Saitama, 2003	O. variabilis μm φ Miyadera Iruma Saitama, 2003

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