SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Euglena gracilis protists. Light micrograph of a group of Euglena gracilis protists. These organisms possess a unique combination of plant and animal characters. Like the algae, E. gracilis is photosynthetic, possessing the pigments chlorophyll a and b. It uses these to capture light energy from the sun, with which it synthesises food in the same way as many plants. It is also, like many protozoa, an active swimmer, moving rapidly by beating an extension of its cell membrane known as a flagellum. E. gracilis is therefore considered to be both an alga and a protozoa and is classified accordingly. Magnification unknown.
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