Species: Cell body hand-mirror in shape, anterior spherical to elliptical, posterior tapered into a spiny cauda when swimming, 39-55 μm long, 18-25 μm wide; cell body changes to fusiform when stopped swimming; 9-16 chloroplasts saucer-shaped, with slightly lobed margin, each containing a pyrenoid at the center; a locomotive flagellum 2-2.5 longer than the cell body; nucleus spherial, 12 μm in diam.; eyespot (stigma) 6 μm long (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

50 μm 100 μm 150 μm; x 400