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).