Species: Cell body deeply constricted, 32-40 μm long, 35-41 μm wide, constriction (isthmus) 11-13 μm wide, semicells reniform, apex slightly elevated and truncate, lateral margins convex and convergent upward, apex, lateral margins and the center of the semicells furnished with granules, other parts of cell walls smooth (Photomicrographs of the Freshwater Algae, vol. 3, 1985).

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Cosmarium ornatum Ralfs: Cell body deeply constricted, 32-40 μm long, 35-41 μm wide, constriction (isthmus) 11-13 μm wide, semicells reniform, apex slightly elevated and truncate, lateral margins convex and convergent upward, apex, lateral margins and the center of the semicells furnished with granules, other parts of cell walls smooth (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
Cell body (32-39)-40 μm long, 33-(36-41) μm wide, isthmus 10-(11-13) μm wide, (Illustrations of the Fresh-water Algae, 1977).