FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Stentor coeruleus protozoan. Light micrograph of Stentor coeruleus amongst green algae. This large single-celled protist measures 0.5 to 2 millimetres when fully extended. It forms a photosynthetic relationship with the algae it eats, causing its blue or green appearance.
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