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 [ var. truncata ]: Cell body 95-98 μm long, 97-98 μm wide, isthmus 22-23 μm wide,

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M. truncata 116, 120 μm L/W=1.1,1.2 Kenashitai Hakkoda mountain Aomori, 2005	M. truncata 124 x 111 μm L/W=1.1 Tashirodaira marsh Hakkoda mountain Aomori, 2006	M. truncata v. quadrata 115,117 x 108 μm L/W=1.1 Sukawa highland Kurikoma mountain Akita, 2005	M. truncata v. quadrata 102 x 97 μm L/W=1.1 Sukawa highland Kurikoma mountain Akita, 2005
M. truncata x μm L/W= Shibayachi m.2 Odate Akita, 2007	M. truncata 112,126 x μm L/W=1.0 Yukawa-numa Nishiwaga Iwate, 2007	M. truncata 109, 111 μm L/W=1.1 Mida-ga-hara Gassan Yamagata, 2005	M. truncata μm L/W= Miyatoko m.5 Minami-Aizu Fukushima, 2008
M. truncata 110, 113 μm L/W=1.0 Oze marsh Katashina Gunma, 2006	M. truncata μm L/W= Ayamedaira 2 Oze marsh Gunma, 2007	M. truncata μm L/W= Kareki-numa Nikko Tochigi, 2008
M. truncata 102,110 μm L/W=1.0,1.1 Shibu-ike Shiga highland Nagano, 2005	M. truncata 105 x 100 μm L/W=1.1 Tanohara marsh Shiga highland Nagano, 2004	M. truncata 116 x 108 μm L/W=1.1 Tanohara marsh Shiga highland Nagano, 2006	M. truncata 120 x 110 μm L/W=1.1 Tanohara marsh 3 Shiga highland Nagano, 2007
M. truncata 110 x 100 μm L/W=1.1 Hyoutan-ike Shiga highland Nagano, 2005	M. truncata 117 x 100 μm L/W=1.2 Hyoutan-ike Shiga highland Nagano, 2007	M. truncata μm L/W= Chigo-ike Shiga highland Nagano, 2008
M. truncata 112 x 105 μm L/W=1.1 Imou bog Toyohashi Aichi, 2004	M. truncata 130 x 114 μm L/W=1.1 Imou bog Toyohashi Aichi, 2006

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

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