Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, 22-(32-43)-60 μm long, 10.5-(20-23)-32 μm wide, isthmus 9.5-(18-21.5)-30 μm wide, L/W=2; semicells ovoidal; (Illustrations of the Japanese Fresh-water Algae, 1977).
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C. curtum ?
40 x 20 μm
Fukasaku
Saitama, 2002
C. curtum ?
with a parasitic fungus ?
Fukasaku
Saitama, 2002
C. curtum
40-43 x 19-21 μm
near Tama river
Chofu
Tokyo, 2004
C. curtum
46 x 22 μm
Riverside green l.
Sawara
Chiba, 2004
C. curtum
42 x 23 μm
standing water
Akigase park
Saitama, 2005
C. curtum
45 x 24 μm
near Kurome r.
Asaka
Saitama, 2006