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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus perforatus
Lemmermann
or Scenedesmus oahuensis (Lemmermann) G.M. Smith (P. Bourrelly, 1966)

Scenedesmus perforatus 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 sometimes surrounded by mucilage; cell body cylindrical to spool-shaped, with broadly rounded ends and slightly concave sides, 10-21 μm long, 3-8 μm wide; cells arranged in a linear series contacting at the polar regions of the sides making intercellular perforation between the cells; outer cells with slightly convexed outer side and a long, slightly curved spine at each corner; cell wall smooth or punctate (Photomicrographs of the Freshwater Algae, vol. 16, 1996).


Scenedesmus perforatus Lemmermann, cell body 19 μm long, 6-8 μm wide, spines 11 μm long, x 640, Pond, Kitayama park, Nishi-no-miya city, Hyogo Pref., Japan, September 10, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Scenedesmus perforatus Scenedesmus perforatus Scenedesmus perforatus


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