MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Polarised light micrograph of a Stentor sp. freshwater ciliate protozoan with algal symbionts inside it (green), called zoochlorella. The zoochlorella photosynthesise inside the protozoan, providing it with sugars and oxygen, while deriving protection from their host. Surrounding the Stentor are strands of spirogyra sp. filamentous green algae. Some Stentor species can grow to several millimetres in length, making them among the largest single-celled organisms. Magnification: x330 when printed 10 centimetres wide.
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