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Heterokonta: Raphidophyceae: Raphidomonadales

Gonyostomum depressa
(Lauterborn.) Lemmermann

Genus (Diesing): Cells obovate or almost spherical, flattened dorsoventrally; rod-shaped trichocysts around cell periphery or concentrated at the 2 ends of the cell; flagella usually same length as cell; but trailing flagellum may reach twice that length; many chloroplasts in a single layer in the cell periphery (Illustrated Guide, 1985). (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body circular in shape, dorsoventrally flattened, about 35 μm long, 10 μm in thickness; a nucleus ellipsoidal, located at the center of the cell body; many elliptical chloroplasts located at perphery of the cell body; trichocysts uniformly distributed (Illustrations of The Japanese Fresh-water Algae, 1977).

Gonyostomum depressa (Raphidomonadales, Raphidophyceae), tape No. 0047, time code 0000, cell body spherical, flattened dorsoventrally, 39 μm long, 31 μm wide, many rod-shaped trichocysts around cell periphery, two flagella (length unequal or equal ?), nucleus centrally located, contractile vacuole anterior, Saitama Pref., Japan, June 2000, by Y. Tsukii

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