Genus: Cell body flat, large, variable in shape, longer than wide; strong constriction at center; each semicell with several notches; cell wall with many short spines (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 77 μm long, 73 μm wide, isthmus 13 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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M. ceylanica or zeylanica 70 x 70 μm Sukawa highland Kurikoma mountain Akita, 2005	M. ceylanica or zeylanica μm Miyatoko m.5 Minami-Aizu Fukushima, 2008	M. ceylanica or zeylanica μm Miyatoko m.3 Minami-Aizu Fukushima, 2008
M. ceylanica or zeylanica μm Kareki-numa Nikko Tochigi, 2008.8	M. ceylanica or zeylanica μm Kareki-numa Nikko Tochigi, 2008.9	M. ceylanica or zeylanica 73 x 72 μm Numappara m. Kuroiso Tochigi, 2003	M. ceylanica or zeylanica μm Numappara m1 Nasu-shiobara Tochigi, 2007
M. ceylanica or zeylanica 83 x 80 μm Dojo-ike Norikura highland Nagano, 2006
M. ceylanica or M. decemdentata ? μm Lake Biwa Maibara Shiga, 2008	M. ceylanica or M. decemdentata ? 62 x 70 μm L/W=0.9 Uruguay, 1999

Similar species -->> M. truncata; M. decemdentata;

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