Genus: Cell body short, with a deep constriction at the center, apical view fusiform or radially symmetrical;
cell apexes without spiny projections; intermediate zone or folded structure appeared during cell division;
zygospores remain within their mother cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Cell body 20-26 μm long, 14-27 μm wide, L/W=1,
outline shape transversely rectangular, apical angles form a connecting process with adjacent cells,
which makes elliptic excavation between adjacent cells; vertically triangular, sides slightly
convex and angles rounded; filaments untwisted
(Photomicrographs of the Freshwater Algae, vol. 1, 1984).
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