Species (var. minima Mainx, 1927): Cell body spidle in shape, 29-42 μm long, 11-17 μm wide, euglenoid movement rare, 3-6 (rarely 7) chloroplasts saucer-shaped or rectangular with wavy margin, a pyrenoid covered with paramylon sheath located at the center, a locomotive flagellum nearly the same length as the cell body, nucleus spherical, 8 μm in diam., stigma (eye spot) 3 μm (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

31 μm 63 μm 94 μm; x 640