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: Cell body elongated spindle in shape, straight or curved, sharply pointed at both ends; (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

Daughter cells attached each other
Monoraphidium sp. stock Ssa-4 58-62 x 3-3.5 μm L/W=17-21 Sayama Saitama, 2001	Monoraphidium sp. 51 x 2.5 μm L/W=20 Iwajuku Gunma, 2001	Monoraphidium sp. 51 x 3 μm L/W=17 Nasu Tochigi, 2001	Monoraphidium sp. 49 x 3 μm L/W=16 Ueno Tokyo, 2001
Monoraphidium sp. stock Tus-2 & 3 59 x 3 μm L/W=20 Tokyo, 2001	Monoraphidium sp. x 2.5 μm Mizuko-kaizuka p. Fujimi Saitama, 2004	Monoraphidium sp. 43 x 3 μm L/W=14 Akigase Park Saitama, 2002	Monoraphidium sp. 53 x 4.7 μm L/W=11 central constriction Sayama Saitama, 2001
Monoraphidium sp. 41 x 4 μm L/W=10 central constriction ? Shakujii Park Tokyo, 2001	Monoraphidium sp. μm L/W= O-ike park Yabuki Fukushima, 2003	Monoraphidium sp. 45 x 3 μm L/W= near Town Hall Shobu Saitama, 2004	Monoraphidium sp. 46 x 4 μm L/W= water reservoir near Yamaguchi Univ. Yamaguchi, 2004
Monoraphidium sp. 72 x 4 μm L/W=18 Jionji-shinsui p. Iwatsuki-ku Saitama, 2006

Similar species -->> Ankistrodesmus densus;

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