published in life
An Autotrophic Flagellate: the Euglena
The euglena is a flagellate that can complete photosynthesis if exposed to direct light, and that loses its photosynthetic pigments if kept in the dark and starts feeding on dead organic matter. Once back to light, the euglena starts photosynthesis again. The Figure clearly shows the chloroplast, the organelles in which photosynthesis takes place. The flagellum is used to move in a wave-like motion. The spiracle is a pigment-rich area, probably associated with the photoreceptor.