Genus: Colony of 4 or 16 cells arranged nearly parallel, within a gelatinous sheath, planktonic;
cell body elongated spindle-shaped, slightly curved; a single chloroplast plate-like, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Colonies of 4, 8 or 16 cells embedded in a gelatinous matrix; four cells arranging parallel; cell body needle-shaped, 20-60 μm long, 1.5-5 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
Images of collecting locality:
No.5, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 22, 2006 by Y. Tsukii