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:

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Corners of incisions rounded; number of incisions 33 in each semicell
M. denticulata v. denticulata 290 x 244 μm Komado marsh Showa and Tajima Fukushima, 2004	M. denticulata v. denticulata ? 320 x 252 μm Komado marsh Showa and Tajima Fukushima, 2004	M. denticulata v. denticulata 240, 248 μm Sukawa highland Kurikoma mountain Akita, 2005	M. denticulata v. denticulata ? 240, 246 μm Sukawa highland Kurikoma mountain Akita, 2005
M. denticulata v. denticulata 273 x 210 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	M. denticulata v. denticulata ? stock Atoi-4 190 x 146 μm Imou bog Toyohashi Aichi, 2004	M. denticulata v. denticulata ? stock Atoi-3 170 x 144 μm Imou bog Toyohashi Aichi, 2004	M. denticulata v. denticulata 218 x 165 μm Imou bog Toyohashi Aichi, 2006
M. denticulata v. denticulata μm Yamamuro m.8 Maibara Shiga, 2008	M. denticulata v. denticulata μm Kashibaru 2-3 Karatsu Saga, 2008	M. denticulata v. denticulata μm Kareki-numa Nikko Tochigi, 2008	M. denticulata v. denticulata μm Motoyu marsh Nikko Tochigi, 2008
Corners of incisions rounded; number of incisions 17 in each semicell
M. denticulata v. angulosa 272,288,290 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	M. denticulata v. angulosa 276 x 230 μm Onnenai Kushiro marsh Hokkaido, 2005	M. denticulata v. angulosa 260 x 205 μm 253 x 210 μm Imou bog Toyohashi Aichi, 2004	M. denticulata v. angulosa stock Atoi-3 205 x 177 μm Imou bog Toyohashi Aichi, 2004
M. denticulata v. angulosa 340 x 260 μm Komado marsh Showa and Tajima Fukushima, 2004	M. denticulata v. angulosa ? 304 x 230 μm Komado marsh Showa and Tajima Fukushima, 2004	M. denticulata v. angulosa 302,310 x 260 μm Komado marsh Showa and Tajima Fukushima, 2007	M. denticulata v. angulosa μm Miyatoko m.5 Minami-Aizu Fukushima, 2008
Corners of inscisions pointed; similar to M. thomasiana v. notata
M. denticulata v. japonica ? μm Numappara Tochigi, 2003	M. denticulata v. japonica 225-230 x μm Kowashimizu Suwa Nagano, 2005	M. denticulata v. japonica μm Dojo-ike 2 Norikura highland Nagano, 2007

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