Genus: Colony of 4 cells attached to a gelatinous sheath at their posterior end,
arranging cruciform; cell body ovoidal; two equal-length flagella emerging at their anterior end;
a single chloroplast cup-shaped, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Images of collecting locality:
Iruma Park, Koyo-dai, Iruma city, Saitama Pref., Japan, March 18, 2006 by Y. Tsukii