CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY CLOUDS HILL IMAGING LTD / SCIENCE PHOTO LIBRARY
Shelled amoeba. Coloured scanning electron micrograph (SEM) of a shelled (testate) amoeba, a single-celled (protozoan) organism found in damp soil, leaf litter and pools. There are two main types of shelled amoeba; the one pictured forms its test (shell) by producing small plates, cemented together. Other types use sand grains or other particles to form a test.
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