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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus armatus
var. bicaudatus (Guglielmetti) Chodat

Scenedesmus 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. arumatus ]: Colonies of 2, 4, 8 cells arranging linearly or slightly sigzag; cell body ovoid or elongated ellipsoidal, both ends rounded, 10-20 μm long, 3.5-8 μm wide; each cell with longitudinal ridges on both sides, ridges distinct at both ends but unclear at the center; outer cells with spiny projections (8-15 μm long) at both ends
[ var. bicaudatus ]: Cell body 10-15 μm long, 2.5-5 μm wide; outer cells with a spiny projection only on one end (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> S. bicaudatus (without ridges); S. quadricauda var. longispina f. asymmetricus;


Scenedesmus armatus var. bicaudatus (Guglielmetti) Chodat, cell body 12 μm long, 4.5 μm wide, spines 9 μm long, longitudinal ridges present, x 640, Naga-ike (pond), Shinbaru, Sue-machi (Sue town), Fukuoka Pref., Japan, October 2001 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 Scenedesmus


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