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Diatom frustules (pennate and centric), SEM

Diatom frustules (pennate and centric), SEM

C032/1247

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Credit

DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY

Caption

Coloured scanning electron micrograph (SEM) of pennate (Diatoma sp.) and centric (Coscinodiscus sp.) marine diatom frustules (skeletons). These marine diatoms are found in both brackish and salt water. Diatoms are a type of algae (Chromophyta, Bacillariophyceae). They consist of two valves, made of silica (hydrated silicon dioxide), which fit together like the top and bottom of a box. The exterior of the valves are often highly decorative, with pores, spikes or other types of projections. They are important alga in the marine food chain. Magnification: x345 when shortest axis printed at 25 millimetres.

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