Genus: Two chloroplasts plate-like or slightly spiralled;
a nucleus centrally located between the chloroplasts; mostly unicells, filaments rare
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: cell body cylindrical 162-(185-230)-236 μm long, 11-(12)-14 μm wide, L/W = 14-25 (or 40), cell wall smooth, both ends not swelled, 2 chloroplasts with 4-10 pyrenoids in each (Illustrations of The Japanese Fresh-water Algae, 1977).
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