image_list image_listE

Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus armatus
(Chodat) G. M. Smith var. armatus
= Desmodesmus armatus (Chodat) E. Hegewald

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).


Scenedesmus armatus (Chodat) G. M. Smith, cell body 12 μm long, 4 μm wide, spines 5 μm long, x 640, Iruma river, Sayama city, Saitama Pref., Japan, January 25, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus Scenedesmus


Please click on images for viewing enlarged.
Copyright Protist Information Server