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Dinophyceae: Peridiniales: Peridinaceae
Dinoflagellida: Diniferina: Peridiniidae

 Peridinium pygmaeum
Lindemann 1918

Peridinium Genus (Ehrenberg): Body round to polygonal; cingulum median, deep; thecal plates 5-6 in cingulum; some with apical and antapical horn (Illustrated Guide, 1985). Epicone (or epitheca) consists of 11-14 thecal plates; hypocone (or hypotheca) of 7-8 thecal plates (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Peridinium pygmaeum Lindemann 1918 (Glenodinium pygmaeum (Lindemann) Schiller 1937), cell body 33 μm long, 28 μm wide, x 640, standing water near Tama river, Komae city, Tokyo, Japan, February 24, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Peridinium pygmaeum Peridinium pygmaeum Peridinium pygmaeum Peridinium pygmaeum Peridinium pygmaeum

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