image_list image_listE

Euglenophyceae: Euglenales (or Colaciales)

Colacium sp.

Colacium Genus: Cell body attached to others by gelatinous stalk emerging from anterior end; cell division occurs on the stalk forming dichotomously branching colony; pellicles soft but euglenoid movement rare; chloroplasts soucer-shaped in some species examined; a pyrenoid present at the center; a canal opened near anterior end; stigma present (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Similar genus -->> Characium (Chlorophyta); Characiopsis (Heterokonta);

Colacium sp. ??, cell body 15 μm long, 5 μm wide, 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
Colacium Colacium Colacium Colacium

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