Family: Colonies consisting of a fixed number of cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Flattened colonies of 16 or 8 cells embedded in gelatinous sheaths; cells nearly spherical, with two flagella of equal length, a stigma and two contractile vacuoles; a single chloroplast cup-shaped, with a single or several pyrenoids (Photomicrographs of the Freshwater Algae, vol. 2, 1984).
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G. formosum
11 samples
colony of 16 cells
colony 43-95 μm
cell 7-16 μm
2001-2008
G. formosum
11 samples
colony of 16 cells
colony 43-95 μm
cell 7-16 μm
2001-2008
G. pectorale
15 samples
cell 5.5-17 μm
1999-2006
G. pectorale
15 samples
cell 5.5-17 μm
1999-2006
G. quadratum
colony of 8, 16 cells
cell μm
Tsuchiura
Ibaraki, 2003
Gonium sp. ?
cell μm
near Nan-ko
Shirakawa
Fukushima, 2003
