GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Parasitic protozoan. Differential interference contrast micrograph of a parasitic Metaradiophrya sp. ciliate protozoan, showing two rows of contractile vacuoles (circles), and the hook-like holdfast (upper right) that it uses to attach itself to its host. This parasite lives in the guts of earthworms and is covered in tiny hair-like structures (cilia) which it uses for locomotion. Magnification: x230 when printed 10 centimetres wide.
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