Species:
Cell body (67-76)-90-105 μm long, (50-62)-75-90 μm wide,
isthmus (49-56)-79 μm wide, L/W=1.3; semicells half-circular in shape;
constriction weak (Illustrations of the Fresh-water Algae, 1977).
Similar species -->>C. connatum;
Cosmarium alpestre Roy et Bisset (small variety ?),
cell body 34 μm long, 29 μm wide, constriction (isthmus) 28 μm wide,
x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii 50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
50 μm
