WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Stentor amethystinus heterotrich ciliate, darkfield illumination light micrograph. They have been attracted by the microscope's light, a phenomenon known as phototaxis. This species contains endosymbiotic algae (Chlorella sp., green dots). Magnification: x50 when printed 10 centimetres wide.
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