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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus quadrispina
Chodat
Syn.: S. quadricauda (Turpin) Brébisson var. quadrispina (Chodat) G. M. Smith

Scenedesmus quadrispina Genus: Colonies of 4 (or 2, 8, 16) cells attached side by side, arranged linearly or zigzag; cell body elliptical or spindle or crescent in shape; terminal cells with spiny projections in many species; cell wall usually smooth, but in some species granulated or dented or ridged (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body broad ovoidal, 8.5-16 μm long, 4-7 μm wide; spiny projections of outer cells short (3-7 μm long) (Illustrations of The Japanese Fresh-water Algae, 1977).

Scenedesmus sp. (similar to S. quadrispina Chodat, but inner cells with short spines), cell body 13-14 μm long, 5 μm wide, spines curved inward, up to 12 μm long, x 640, Kayoicho-ike (pond), Kasuya town, Fukuoka Pref., Japan, October 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus quadricauda Scenedesmus quadricauda

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