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Raphidophyceae: Raphidomonadales

Gonyostomum semen

Gonyostomum 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 inverted ovoidal, posterior end pointed, compressed dorso-ventrally, 45-70 μm long, 20-30 μm wide, 10-20 μm in thickness; a nucleus ellipsoidal, located at the center of the cell body; a resorvoir and contractile vacuole at the anterior end; many chloroplasts light-green, disc-shaped at periphery of the cell; trichocysts anteriorly many and scattered posteriorly (Illustrations of Japanese fresh-water algae, 1977).
Similar genus ->> Vacuolaria;

Gonyostomum semen Diesing ?, cell body 49 μm long, 27 μm wide, L/W=1.8, x 640, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, September 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Gonyostomum semen Gonyostomum semen
Cell body 43 μm long, 20 μm wide, L/W=2.2, x 640
Gonyostomum semen Gonyostomum semen

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