Genus: Filamentous algae without branching; a single plate-like chloroplast in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 30-140 μm long, 8-13 μm wide; 4-8 pyrenoids in each cell; zygotes spherical, 13-25 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body 8-12 μm in diam.
M. parvula ? 140-145 x 9 μm Sukawa highland Kurikoma mountain Akita, 2005	M. parvula ? x 10 μm Komado marsh Showa and Tajima Fukushima, 2004	M. parvula ? x 11 μm Komado marsh Showa & Tajima Fukushima, 2004	M. parvula ? 128 x 12 μm Komado marsh Showa & Tajima Fukushima, 2007
M. parvula ? x 10 μm Omine-numa Tsukiyono Gunma, 2003	M. parvula ? x 10 μm Omine-numa Minakami Gunma, 2006	M. parvula ? 35-77 x 8 μm Kusatsu Onsen b.t. Kusatsu Gunma, 2005	M. parvula ? 130 x 10 μm Kakuman river Akagi mountain Gunma, 2005
M. parvula 101,113 x 11 μm Senjo-ga-hara Nikko Tochigi, 2003	M. parvula 64 x 10.5 μm Ohnuma Nasu-shiobara Tochigi, 2006	M. parvula ? 96 x 10 μm Omiya Saitama, 2001
M. parvula 83 x 11.5 μm Ichinose-enchi Norikura highland Nagano, 2005	M. parvula 56-64 x 10.5 μm Oyomi marsh Hakuba Nagano, 2006	M. parvula ? 110 x 10 μm Lake Shirakaba Tateshina & Chino Nagano, 2005	M. parvula 77 x 8 μm near Karakemi m. Omachi Nagano, 2005
M. parvula ? 77 x 8 μm Iyari marsh Omachi Nagano, 2006	M. parvula ? 105-110 x 11 μm Tane-ike Togakushi highland Nagano, 2005	M. parvula ? 89 x 11.5 μm Tane-ike Togakushi highland Nagano, 2006
M. parvula ? x 11 μm Hakama marsh Madarao highland Niigata, 2005	M. parvula ? 45-58 x 10 μm Numa-no-hara m. Madarao highland Niigata, 2005
M. parvula ? x 11 μm Imou bog Toyohashi Aichi, 2004	M. parvula ? 50-100 x 10 μm Kashibaru m.2 Karatsu Saga, 2006	M. parvula ? x 10-11 μm Japan, 199?	M. parvula ? 125 x 11 μm Japan, 1997

Similar genus -->> Gonatozygon;

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