Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
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).
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Subgenus Eumicrasterias: Section Actinocystis: Apex incised or cocaved
M. rotata
9 samples
175-290 μm
1999-2008
M. thomasiana
14 samples
220-284 x μm
2005-2008
M. denticulata
21 samples
190-340 μm
2003-2008
M. denticulata
21 samples
190-340 μm
2003-2008
M. brachyptera
3 samples
μm
2004, 2008
M. apiculata
6 samples
200-266 μm
1998-2008
M. papillifera
7 samples
81, 135 μm
1999-2008
M. crux-melitensis
14 samples
86-188 μm
1998-2006
M. foliacea
3 samples
81-89 μm
1998-2001Subgenus Eumicrasterias: Section Tetrachastrum: Apex flat
M. truncata
20 samples
102-130 μm
L/W=0.9-1.2
2004-2008
M. ceylanica
or zeylanica
10 samples
62-83 x μm
1999-2008
M. decemdentata
2 samples
67 x 56 μm
Hakuba
Nagano, 2004
M. pinnatifida
5 samples
61-65 x μm
1998-2008
M. depauperata
v. wollei
134 x 127 μm
USA, 1999
M. laticeps
v. laticeps
128 x 144 μm
USA, 1999
M. laticeps
v. acuminata
91 x 109 μm
Uruguay, 1999Subgenus Atomocystis: Section Serratae
M. mahabuleshwarensis
var. wallichii
162 x 84 μm
Niigata, 2001
M. furcata
Syn. M. radiata
134 x 124 μm
USA, 1999
Movies
M. americana
Ohnuma
Nasu-shiobara
Tochigi, 2008