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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 24 μm long, 19 μm wide, x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gymnodinium paradoxum Gymnodinium paradoxum

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