GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Gonyostomum semen, a green flagellate. There are typically two flagella inserting subapically, one projecting forwards in swimming cells, the other trailing. With many discoidal plastids, with chlorophylls a and c, but in this genus the plastids look as green as those of chlorophytes and euglenids. Distinguish from those two groups because it does not have a cell wall as do chlorophytes, and it does not have the ridged pellicle. Microscopic contrast method : Differential interference contrast. Magnification 580x when printed at 10 centimetres wide.
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