image_list image_listE

Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium dorsitruncatum
(Nordstedt) G.S. West

Cosmarium dorsitruncatum 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:

Cosmarium dorsitruncatum (Nordstedt) G.S. West (large variety ?), cell body 33 μm long, 30 μm wide, L/W=1.1, isthmus 11 μm wide, x 640, No.1, Kejo-numa, Furukawa-Ono, Osaki city (formerly Furukawa city), Miyagi Pref., Japan, October 29, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium dorsitruncatum
Cell body 40 μm long, 31 μm wide, L/W=1.3, isthmus 10 μm wide, x 640
Cosmarium dorsitruncatum

Images of collecting locality: No.1, Kejo-numa, Furukawa-Ono, Osaki city (formerly Furukawa city), Miyagi Pref., Japan, October 29, 2006 by Y. Tsukii

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