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Dinophyceae: Gymnodiniales: Gymnodiniaceae
Dinoflagellida: Diniferina: Gymnodiniidae

 Gymnodinium paradoxum
A.J. Schilling 1891

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: Cell body 36-40 μm long (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000)

Gymnodinium paradoxum Schilling 1891 ?, cell body 40 μm long, 37 μm wide, x 640, Mida-ga-hara (bog), Gassan (mountain), Haguro & Tachikawa town, Yamagata Pref., Japan, July 10, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gymnodinium Gymnodinium
Cell body 35 μm long, 34 μm wide, x 640
Gymnodinium

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