Morphology and Structure
G. sanguineum has numerous large, spindle-shaped, reddish-yellow-brown chloroplasts radiating from the center of the cell (Fig. 4). The large nucleus is slightly off-center (Figs. 3, 4). Cells can vary from heavily pigmented to pale yellow or nearly colorless. Mixotrophy has been observed for this species: in the Chesapeake Bay G. sanguineum preys on ciliate protozooplankton.
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