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Chlorophyceae: Chlorococcales: Scenedesmaceae

 Scenedesmus quadricauda
(Turpin) Brébisson sensu Chodat, 1913

Scenedesmus quadricauda 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 [ var. quadricauda ]: Colonies of 2, 4 or 8 cells arranging linearly; cell body elongated ellipsoidal, 11-18 μm long, 3.5-7 μm wide; terminal cells with long spiny projections (10-17 μm long); cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).
->> Cell division

Scenedesmus quadricauda or S. longispina ?, cell body 18 μm long, 5.5 μm wide, spines 22 μm long, L/W= 3.3, S/L = 1.2, x 400, x 640, Karasu-ga-mori koen, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, January 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus

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