Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Colony of 4 or 16 cells arranged nearly parallel, within a gelatinous sheath, planktonic; cell body elongated spindle-shaped, slightly curved; a single chloroplast plate-like, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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Q. chodatii 27 x 3 μm Nasu Tochigi, 2001	Q. chodatii 27 x 3 μm Mashiko Tochigi, 1999	Q. chodatii 31 x 3.5 μm Uruguay, 1999	Q. chodatii 27 x 2 μm USA, 1999
Q. chodatii μm Omine-numa Tsukiyono Gunma, 2003	Q. chodatii 24 x 1.5 μm 28 x 2.5 μm near Yamaguchi Univ. Yamaguchi, 2004	Q. chodatii 28 x 1.5-3 μm Ichinose-enchi Norikura highland Nagano, 2005	Q. chodatii 20-22 x μm Tane-ike Togakushi highland Nagano, 2005
Q. chodatii 20 x 1.5-2 μm Hasu-ike Shiga highland Nagano, 2005	Q. chodatii 23 x 2 μm Mizumoto park Tokyo, 2001	Q. chodatii 22-23 x 2 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	Q. chodatii 22-26 x 2 μm Kashibaru m.5 Karatsu Saga, 2006
Q. chodatii μm Chiba-Minato Park Chiba, 2003	Quadrigula sp. ? Chlorolobion ? 47 x 2 μm Abiko Chiba, 2000	Quadrigula sp. ? Chlorolobion ? 51 x 4 μm Kyoto, 2000

Similar genus -->> Chlorolobion; Ankistrodesmus; Monoraphidium;

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