Genus: Cell body elongated spindle in shape, straight or curved, sharply pointed at both ends; (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Cell body spindle-shaped, moderately curved, with blunt ends, 8-17 μm long, 1.5-3.5 μm wide; a chloroplast parietal with a naked pyrenoid (invisible under photomicroscope); cell division produces 4 or 8 "autospores" (Photomicrographs of the Freshwater Algae, 1997).

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Daughter cells attached each other
M. lunare 12-19 x 2-2.5 μm L/W=4.8-9.5 Sayama Natural p. Saitama, 2001	M. lunare stock Sto-1, axenic 7.5-15 x 4-5 μm L/W=2-3 Sayama Natural p. Saitama, 2001	M. lunare μm L/W= Mizuko-kaizuka p. Fujimi Saitama, 2003	M. lunare ? μm L/W= Mizuko-kaizuka p. Moroyama town Saitama, 2003
M. lunare ? μm L/W= Ichino-kawa Namegawa Saitama, 2004

Similar species -->> Ankistrodesmus densus;

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