Subgenus: lacks arm-like projections
Section [ Stellatiformes ]: Semicells with lines of spines
(Illustrations of The Japanese Fresh-water Algae, 1977)
Species [ var. forficulatum ]:
Cell body medium in size, 40-47.6 μm long, 37-60 μm wide (excluding spines),
marginal projections present at both anterior and posterior sides of semicells,
corner projections with dichotomous spines.
[ var. verrucosum ]:
Cell body 39-45 μm long, 37-42 μm wide (excluding spines)
corner projections with trichotomous spines
(Illustrations of The Japanese Fresh-water Algae, 1977)
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