Order: Cell body without theca
(Illustrations of The Japanese Fresh-water Algae, 1977).
Family:
Genus:
Gyrodinium (or Katodinium vorticella ?),
cell body 44 μm long, 38-44 μm wide,
x 200?, x 400, x 640, Kurome river, Asaka city, Saitama Pref., Japan, November 1998 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640