Dinema validum. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics.
This work was supported by the Australian Biological Resources Study. This image was provided by Angelika Preisfeld and David Patterson. Image copyright: Angelika Preisfeld and D. J. Patterson, image used under license to MBL (micro*scope).
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From the collection
Freshwater euglenids - NW Australia
|Description of Dinema validum: Cell outline is oblong to ovate. Cells are 32 to 53 microns long, 22 to 27 microns wide, with a slightly thickened pellicle, metabolic. There are about 16 wide longitudinal striations on both faces of the cell and these follow an S-helix. Dorsal striations are more distinct than ventral ones. The anterior flagellum is as long as the cell and beats with a sweeping motion. The posterior flagellum is approximately 3 times the cell length, is thicker than the anterior flagellum and emerges as a hook from the flagellar pocket, which is in the left hand side of the cell. The wedge-shaped ingestion apparatus has two rods but may be difficult to see at times. It extends halfway down the cell. The cells consumed diatoms as long as 16 microns. The nucleus is usually in the right posterior end of the cell but may be in the left side. The cells move by gliding and may undergo squirming movements. When changing direction, the cells jerk backwards and then continue to move forward. |