Genus: A single trichome within a rigid sheath; sheath clear or yellowish; filaments planktonic or agglutinated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 4-5 μm long, 2 μm wide, L/W=2-2.5 (Illustrations of The Japanese Fresh-water Algae, 1977).

O. splendida v. splendida ? 4-8 x 2.5 μm L/W=1.6-3.2 Watarase Wetland Fujioka Tochigi, 2005

O. splendida v. truncata 3-8 x 2.5-3 μm L/W=1.2-2.7 near Yamaguchi Univ. Yamaguchi, 2004

O. splendida v. truncata 5.5 x 2.5 μm Futayo-no-ike Haguro Yamagata, 2006

O. splendida v. truncata 6 x 2.5 μm Ohnuma Nasu-shiobara Tochigi, 2006

Similar species -->> O. acutissima;

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