Species: Colonies of 4, 8, 16 or 32 cells, pyramidal, cubical or polygonal in shape;
cells conical or tetrahedral in shape, sides concave, corners truncated, 6-17 μm
in diam.; cells connected to adjacent cells by the projected corners forming a large polygonal space between the cells
(Photomicrographs of the Freshwater Algae, vol. 2, 1984).
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