Genus: Cingulum (horizontal groove) located at the center of the body
(Illustrations of The Japanese Fresh-water Algae, 1977).
Cingulum more or less median; sulcus straight (Illrustrated Guide, 1985).
Species:
Gymnodinium carinatum Schilling 1891,
cell body 39 μm long, 25 μm wide,
x 400, x 640, Handa numa (marsh), Otawara city, Tochigi Pref., Japan, January 1999 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640