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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 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
scale 31 μm scale 63 μm scale 94 μm; x 640
Gymnodinium Gymnodinium Gymnodinium Gymnodinium

Images of collecting locality: Banpaku memorial park, Tsukuba city, Ibaraki Pref., Japan, January 24, 2006 by Y. Tsukii

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