WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Stentor amethystinus heterotrich ciliate, brightfield illumination light micrograph. This species contains endosymbiotic algae (Chlorella sp., green dots). Around the rim of the cell (upper right) fused cilia form membranelles that beat to collect food. Magnification: x125 when printed 10 centimetres wide.
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