Order: Cell body without theca (Illustrations of The Japanese Fresh-water Algae, 1977).
Family:
Genus:
->> Description at WPRNO Google Image Search
Gyrodinium sp.
44 x 44 μm
Kuromi river
Saitama, 1998
Gyrodinium sp. ?
48 x 40 μm
Kowashimizu
Suwa
Nagano, 2005
Gyrodinium sp. ?
30 x 26 μm
Matsumoto
Nagano, 2001