image_list image_listE

Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium nasutum

Cosmarium nasutum Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small in size, 35-42 μm long, 28-36 μm wide, isthmus 8.5-13 μm wide, L/W=1.25; semicells semicircular, margins crenated with 8 projections; two granules present on each projection, side view rectangular, convex at the center, apical view elliptical (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium nasutum Nordstedt, cell body 32 μm long, 29 μm wide, isthmus 11 μm wide, L/W=1.10, x 400, x 640, Saitama Pref., Japan, May-June 1999 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium Cosmarium Cosmarium Cosmarium

Please click on images for viewing enlarged.
Copyright Protist Information Server