STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Euplotes ciliate protozoan. Coloured scanning electron micrograph (SEM) of a ciliate protozoan (Euplotes sp.). This single-celled organism is found in fresh and marine water. It is covered in cilia (microscopic hairs) that are used for locomotion and to waft food towards its mouth. It feeds on bacteria and decaying organic matter, which it filters through membranelles (rows of fused cilia green) in its primitive mouth, known as a buccal cavity. Magnification: x2000 when printed at 10 centimetre.
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