Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: Colonies consiting of orderly arranged cells; diameter of cells at transverse section is the same as its length (Illustrations of The Japanese Fresh-water Algae, 1977).

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All cells larger than 4 μm (5-9 μm)
M. elegans ? 8 x 6 μm near Tanohara marsh Shiga highland Nagano, 2006	M. elegans ? 8 x 6 μm Iroha-numa Azuma mt. Yamagata, 2007	M. elegans ? 7 x 5 μm Kareki-numa Nikko Tochigi, 2008
Cell body sometimes larger than 4 μm (3-6 μm)
M. glauca 6.5 x 5.05 μm Hanasaki water p. Kazo Saitama, 2005	M. glauca 5-6 x 4-4.5 μm Japan, 1998	M. glauca ? cell 6 x 4 μm Tanohara marsh Shiga highland Nagano, 2004	M. glauca ? cell 6 x 4 μm Midagahara Tate-yama Toyama, 2006
M. glauca ? cell 3-6 x 4.5 μm Oze s.k.m. Ozegahara Gunma, 2006	M. glauca cell μm Okegawa Saitama, 2002	M. glauca cell μm Numappara marsh Kuroiso Tochigi, 2003	M. glauca ? 4.5-5 x 3-3.5 μm Tanohara marsh Shiga highland Nagano, 2004
M. glauca ? 6-8 x 5 μm Tanohara Natural p. Ontake highland Nagano, 2005
Cell body larger than 2 μm (2.5-3.5 μm)
M. convoluta cell 4.5 x 3.5 μm Kawaguchi Natural p. Kawaguchi Saitama,2005	M. convoluta cell 4.5 x 2.3 μm Kiyose Tokyo, 2001	M. convoluta μm Higashi-Urawa Saitama, 2001	M. convoluta 4.5 x 3 μm Mida-ga-hara Gassan (mt.) Yamagata, 2005
M. convoluta μm Omine-numa Tsukiyono Gunma, 2003	M. convoluta 6 x 4 μm Omoi river Oyama Tochigi, 2004	M. convoluta 5 x 3 μm Tanohara marsh Shiga highland Nagano, 2006	M. convoluta μm Iruma river Sayama Saitama, 2004
M. convoluta or M. punctata ? 4.5 x 3.5 μm Iruma river Sayama Saitama, 2004	M. convoluta or M. punctata ? 4 x 3 μm Watasuge marsh Tsugaike highland Nagano, 2005	M. convoluta or M. punctata ? 5 x 4 μm Kamino-tanbo Tsugaike highland Nagano, 2006	M. convoluta or M. punctata ? 4 x 3 μm Imou marsh Toyohashi Aichi, 2006
M. convoluta or M. punctata ? 3.5 x 3.5 μm Omotsubo marsh Tetta-cho Okayama, 2004	M. convoluta 4-6 x 3-3.5 μm Mida-ga-hara 5 Gassan Yamagata, 2006	M. convoluta ? or M. punctata ? or M. tenuissima ? 3.5 x 3.0 μm Kodama Saitama, 2003
Cell body smaller than 2 μm (1.3-2.0 μm)
M. tenuissima 2.3 x 1.5 μm Koshigaya Saitama, 2001	M. tenuissima 3-3.5 x 2.5 μm near Imou marsh Toyohashi Aichi, 2004	M. tenuissima 3 x 2 μm Iroha-numa Zao mountain Yamagata, 2005	M. tenuissima 3 x 2 μm Mida-ga-hara Gassan Yamagata, 2006
M. tenuissima ? 2.5 μm Muneoka Shiki Saitama, 2004
M. minima μm Shakujii Park Tokyo, 2001	M. minima cell 1.2 x 0.9 μm Mizumoto Park Tokyo, 2001	M. minima M. tenuissima ? μm Saitama, 2001	M. minima cell μm Chiba-Minato Park Chiba, 2003
M. minima cell μm Showa-machi g. p. Showa Saitama, 2003	M. minima cell μm Omine-numa Tsukiyono Gunma, 2003	M. minima smaller var. ? Higusa-numa Hikari Chiba, 2003	M. minima cell 1.5 x 1.1 μm near Town Hall Shobu Saitama, 2004
M. minima cell x 1 μm Nanbata castle p. Fujimi Saitama, 2005
M. punctatum cell μm Shishizuka Tsuchiura Ibaraki, 2003	Merismopedia ? 2.5-3 μm Okubo Ryoke Akigase park Saitama, 2004

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