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Chlorophyceae: Chlorococcales: Scenedesmaceae

Scenedesmus arcuatus
Lemmermann

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).
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Cell body ovoid
Scenedesmus arcuatus
var. arcuatus
cell 14 x 7 μm
L/W=2.0
Saitama, 1999
Scenedesmus
var. arcuatus
cell μm
L/W=
Chiba-Minato Park
Chiba, 2003
Scenedesmus arcuatus
var. arcuatus
cell 13 x 5 μm
Tashirodaira m.
Hakkoda mountain
Aomori, 2005
Cell body reniform or ellipsoid
Scenedesmus
var. platidisca
cell 11 x 4.5 μm
Ochiai-numa 2
Noshiro
Akita, 2007
Scenedesmus arcuatus
var. platidisca
cell μm
Kataki-numa
Yuri-Honjo
Akita, 2008
Scenedesmus arcuatus
var. platidisca
cell 15 x 8 μm
L/W=1.9
near Yamaguchi Univ.
Yamaguchi, 2004
Scenedesmus arcuatus
var. platidisca
cell division
cell 11 x 6 μm
L/W=1.8
Koshigaya
Saitama, 2001
Scenedesmus arcuatus
var. platidisca
cell 12 x 8 μm
L/W=1.5
Tega-numa
Abiko
Chiba, 2000
Scenedesmus arcuatus
var. platidisca ?
or S. ecornis ?
cell 12 x 5.5 μm
L/W=2.2
Sanda
Hyogo, 2001
Scenedesmus arcuatus
var. platidisca ?
or S. ecornis ?
cell 10 x 5 μm
L/W=2.0
Umi-no-nakamichi
Fukuoka, 2001
Scenedesmus arcuatus
var. platidisca ?
or S. ecornis ?
cell 10 x 4.5 μm
L/W=2.2
Kabuto-yama
Nishi-no-miya
Hyogo, 2004
Scenedesmus arcuatus
var. platidisca ?
or S. ecornis ?
cell 10 x 5 μm
L/W=2.0
water reservoir
near Yamaguchi Univ.
Yamaguchi, 2004
Similar species -- > > S. ecornis

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Scenedesmus arcuatus
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