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 constricted in the middle, sinus narrow-linear part but acutely open outward,
11-22 μm long, 24-39 μm wide, L/W=2,
constriction 21-28 μm wide;
vertical view of cells triangular, sides straight, angles rounded;
apex broad, with a short connecting process at each apical angle,
excavated in the middle and forming a oblong hollow cavity between the adjacent cells;
semicells transversely subrectangular, lateral margins obliquely truncate;
filaments twisted
(Photomicrographs of the Freshwater Algae, vol. 1, 1984).
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