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Chlorophyceae: Chlamydomonadales (Volvocales): Chlamydomonadaceae
Chlamydophyceae: Chlamydomonadales: Haematococcaceae
Volvocida: Chlamydomonadina: Chlamydomonadidae

Chlorogonium elongatum
(Dangeard) Francé 1897 (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000)
(Dangeard) Dangeard 1899 (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983)

Chlorogonium elongatum Species: Cell body fusiform or elongated ovoid, 20-53 μm long, tapered at both ends, cell wall thin, chloroplasts plate-like, with two large pyrenoids one located at anterior half and another at posterior half, stigma ovoid or pear-shaped, located at anterior 1/4-1/3 of the cell body, many contractile vacuoles (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Cell body fusiform to spindle-shaped, 20-80(-120) μm long, 4-10(-12) μm wide; stigma longitudinally elongated elliptical, located close to tapering anterior end; [var. truncatum Skuja 1956]: 20-35 μm long, 3-5 μm wide; [var. opulentum Ettl 1960]: 120-155 μm long, 10-12 μm wide; [var. gigas Hortobagyi 1979]: 100-110 μm long, 15-17 μm wide; (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
Cell body spindle-shaped, 23-50 μm long, 4-9 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Chlorogonium elongatum (Dangeard) Dangeard, cell body 90 μm long, 10 μm wide, L/W=9.0, x 640, Yasuragi-no-ike (pond), Oura central park, Oura town, Gunma Pref., Japan, February 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Chlorogonium elongatum

Images of collecting locality: Yasuragi-no-ike (pond), Oura central park, Oura town, Gunma Pref., Japan, February 2006 by Y. Tsukii

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