Family: Filamentous algae without branching; cell body cylindrical; chloroplasts band-, plate- or star-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Filamentous algae without branching; a single plate-like chloroplast in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body more than 20 μm in diam.
M. scalaris 34 samples 20-32 μm φ 1998-2007	M. scalaris 34 samples 20-32 μm φ 1998-2007	M. scalaris 34 samples 20-32 μm φ 1998-2007	Mougeotia sp. body curved 100-130 x 22 μm near Imori pond Myoko highland Niigata, 2004
Cell body 12-20 μm in diam.
Mougeotia sp. 20 samples 12.5-19 μm 1998-2006	Mougeotia sp. 20 samples 12.5-19 μm 1998-2006
Cell body 8-12 μm in diam.
M. parvula 49 samples 8-11.5 μm 1998-2007	M. rotundagulata 49 samples 8-11.5 μm 1998-2007	M. viridis 49 samples 8-11.5 μm 1998-2007
Cell body less than 8 μm in diam.
Mougeotia sp. 37 samples 3-7.5 μm φ 1997-2007	Mougeotia sp. 37 samples 3-7.5 μm φ 1997-2007	Mougeotia sp. 37 samples 3-7.5 μm φ 1997-2007	Mougeotia sp. 37 samples 3-7.5 μm φ 1997-2007

Similar genus -->> Gonatozygon;

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