Family: Unicells; cell body spherical, ellipsoidal, or spindle-shaped; without spiny projections or stipes (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Cell body spherical, with many small disc-shaped chloroplasts (Illustrations of The Japanese Fresh-water Algae, 1977).

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B. arhiza 13 μm φ Sendabori Chiba, 2002	B. arhiza stock Cms-1 μm Sendabori Chiba, 2002	B. arhiza ? 35 x 25 μm Yokonuma Sakado Saitama, 2004	B. arhiza ? 15-26 μm Akebono marsh Tsuchiyu-onsen Fukushima, 2005
B. intercedens ? 47 x 37 μm Fukasaku-gawa Yusuichi Saitama, 2002	Botrydiopsis sp. ? 10-23 μm φ near Town Hall Shobu Saitama, 2004	Botrydiopsis sp. ? μm φ Tsukamoto Sakura-ku Saitama, 2004

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