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 256-288 μm long, 192-258 μm wide, constriction 31-40 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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M. rotata 274 x 256 μm 286 x 260 μm Onnenai Kushiro marsh Hokkaido, 2005
M. rotata 290 x 254 μm Ko numa Gunma, 2003	stock Gtk-1-2 axenic culture Ko numa Gunma, 2003	M. rotata μm Ko numa 2 Minakami Gunma, 2008	M. rotata μm Ko numa 3 Minakami Gunma, 2008
M. rotata μm Miyatoko m.3 Minami-Aizu Fukushima, 2008	M. rotata μm Miyatoko m.5 Minami-Aizu Fukushima, 2008	M. rotata μm Iyari marsh 2 Omachi Nagano, 2008	M. rotata μm Oyomi marsh 1 Hakuba Nagano, 2008
M. rotata or M. thomasiana ? 175 x 165 μm USA, 1999

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