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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M. apiculata
μm
Ohnuma
Nasu-shiobara
Tochigi, 2008
M. apiculata
μm
Ko-numa 2
Minakami
Gunma, 2008
M. apiculata
μm
Ko-numa 1
Minakami
Gunma, 2008
M. apiculata
266 x 205 μm
Midori-no-ike
Togakushi highland
Nagano, 2005
M. apiculata
254 x 200 μm
Midori-no-ike
Togakushi highland
Nagano, 2005
M. apiculata
var. ???
232 x 180 μm
Ikenokochi marsh
Tsuruga
Fukui, 2004
M. apiculata
200 x 162 μm
Hiroshima, 1998
Movies 
M. apiculata
μm
Bungo-Mori
Kusu
Oita, 2008
