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Diatom frustule (pennate), SEM

Diatom frustule (pennate), SEM

C032/1254

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Credit

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

Caption

Coloured scanning electron micrograph (SEM) of salt water pennate diatom frustule (skeleton) on the surface of a shell. This marine diatom is 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: x745 when shortest axis printed at 25 millimetres.

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