Species: Colonies forming a slightly curved square or rhomboid, up to 65-90 μm in width;
cell body up to 18-20 μm in diam.
(Photomicrographs of the Freshwater Algae, vol. 2, 1984).
Gonium pectorale Müller,
young colony 46 μm in diam., cell body 8 μm in diam.,
x 640, near Todoroki green land, Kawasaki city, Kanawaga Pref., Japan, May 26, 2004 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Mature colony 55-67 μm, cell body 10-17 μm in diam., x 640