Species:
Cell body medium in size, body length about 4/3 longer than its width,
(67-76)-90-105 μm long, (50-62)-75-90 μm wide,
constriction (49-56)-79 μm wide; semicell half-circle in shape, apex slightly fattened;
cell body covered with minute granules but smooth at the constriction zone;
apical view of the cell body broad ellipsoidal (Illustrations of the Japanese fresh-water algae, 1977).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Cosmarium, stock Sku-1,
axenic culture with KCM and Hyponex (November 5, 2001 to December 18, 2001),
cell body μm long, μm wide,
x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cosmarium alpestre (or C. connatum ?),
stock Sku-1, axenic culture (from March 9 to April 9),
cell body 57 μm long, 47 μm wide, L/W=, isthmus 41 μm wide,
x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cell body μm long, μm wide, L/W=, isthmus 40 μm wide, x 640
Cosmarium alpestre Roy et Bisset: Cell body medium in size, body length about 4/3 longer than its width, (67-76)-90-105 μm long, (50-62)-75-90 μm wide, constriction (49-56)-79 μm wide; semicell half-circle in shape, apex slightly fattened; cell body covered with minute granules but smooth at the constriction zone; apical view of the cell body broad ellipsoidal (Illustrations of the Japanese fresh-water algae, 1977).
* Cosmarium connatum Brébisson: Cell body large in size, body length about 4/3 longer than its width, (62-87)-100 μm long, (45-70)-74 κm wide, constriction 37-53 μm wide; semicell ellipsoidal at front view, nearly circular at side view and cicular or broad ellipsoidal at apical view; cell wall covered with many small pores and dots (Illustrations of the Japanese fresh-water algae, 1977).