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SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Ciliate protozoa (Coleps sp.) feeding on Chlamydomonas algae (green sphere). These tiny single-celled organisms are found in water. They feed on bacteria and decaying organic matter, which they filter through membranelles in their primitive mouth, known as a buccal cavity (seen as an indentation in the cell). The membranelles, rows of fused cilia (short microscopic hairs), are also used for locomotion.
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