A Nomarski differential interference microscopy image illustrating the frustule (silica cell wall) of a marine centric, Aulacodiscus formosus diatom (unicellular alga). Diatoms are photosynthesising algae that live in most aquatic environments, both fresh and salt water. They are non-motile and are restricted to shallow waters as they require sunlight for photosynthesis. A centric diatom is one that displays radial symmetry. More diatom images are available as CIL:39032-39034.
B0007752 Diatom: Aulacodiscus formosus. Wellcome Images available under the following creative commons usage http://creativecommons.org/licenses/by-nc-nd/2.0/uk/
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