Dinoflagellida: Diniferina: Gymnodiniidae
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).
cell body 33 μm long, 23 μm wide, L/W=1.4,
x 640, Banpaku memorial park, Tsukuba city, Ibaraki Pref., Japan, January 24, 2006 by Y. Tsukii
94 μm; x 640
Images of collecting locality:
Banpaku memorial park, Tsukuba city, Ibaraki Pref., Japan, January 24, 2006 by Y. Tsukii
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