Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid.
Species [ var. ocellatum ]: Cell body (20-28)-30 μm long, 17-20-25 μm wide, isthmus 4-(4.8-5.6)-6 μm wide; [ var. grabrum Hinode ]: Cell body 25-26 μm long, 24-25 μm wide, isthmus 6-7 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. ocellatum var. glabrum 30 x 24 μm East of Tojuro 1 Azuma mt. Yamagata, 2007

C. ocellatum var. glabrum 30 x 24 μm East of Tojuro 2 Azuma mt. Yamagata, 2007

C. ocellatum var. glabrum 26 x 25 μm Aka-ike Madarao highland Niigata, 2006

C. ocellatum μm Hiroshima, 1998

Similar species -- >> C. reniforme (Ornatae);

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