Diatom frustules (pennate and centric), SEM

Diatom frustules (pennate and centric), SEM

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Credit: 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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Keywords: 8898b, alga, algae, aquatic, bacillariophyceae, centric, colored, coloured, coscinodiscaceae, coscinodiscales, coscinodiscophyceae, coscinodiscus, diatom, diatoma, diatoms, electron, eukaryote, false-colored, false-coloured, fragilariaceae, fragilariales, fragilariophyceae, frustule, heterokontophyta, marine, micrograph, pennate, phytoplankton, plankton, salt, saltwater, scanning, sea, seawater, sem, silica, skeleton, water

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