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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 37 μm long, 30 μm wide, L/W=1.2, x 640, Ohnuma (a pond at Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, April 1, 2007, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gymnodinium Gymnodinium

Images of collecting locality: Ohnuma (a pond at Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, April 1, 2007, by Y. Tsukii

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