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Dinophyceae: Gymnodiniales: Gymnodiniaceae
Dinoflagellida: Diniferina: Gymnodiniidae

 Gymnodinium sp.

Gymnodinium 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 sp., cell body 21 μm long, 18 μm wide, L/W=1.2, x 640, Kitamoto nature observation park, Kitamoto city, Saitama Pref., January 29, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gymnodinium Gymnodinium Gymnodinium Gymnodinium

Images of collecting locality: damp area at Kitamoto nature observation park, Kitamoto city, Saitama Pref., January 29, 2006 by Y. Tsukii

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