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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus arcuatus
Lemmermann var. arcuatus

Scenedesmus arcuatus 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: Colonies enclosed by a gelatinous envelope, always curved; cell body reniform, sometimes elliptical, with broadly rounded ends, young cells 6.5-7 μm long, 3 μm wide, mature cells up to 16.5 μm long, 9 μm wide; cells arranged in cruciate series (when 2 cells), or in double series, sometimes irregular (when 8 cells) ; cell wall smooth, without teeth, spines or granulations (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
Similar species -- > > S. ecornis


Scenedesmus arcuatus, cell body 14 μm long, 7 μm wide, x 400, x 640, Saitama Pref., Japan, October 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus Scenedesmus


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