Marine diatom, Biddulphia

Marine diatom, Biddulphia

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Caption: False-colour scanning electron micrograph (SEM) of the marine diatom Biddulphia sp. Diatoms are a group of single-celled algae distinguished by their glassy, silica-based cell wall or frustule. The frustule consists of two valves which fit together like the halves of a box; one valve is slightly larger than the other & acts as the "lid" of the box. This micrograph clearly shows the girdle band separating the two valves; the band holds the valves together while permitting cell growth. When the diatom divides, each valve produces a new half inside itself. Diatoms are an important component of marine & freshwater plankton. Magnification: x290 at 35mm size. Yellow tint. Ref.: MICROCOSMOS, figure 5.30, page 103.

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Keywords: alga, algae, algal, biddulphia sp., botany, diatom, diatoms, nature, phytoplankton, plankton, plant, scanning electron micrograph, sem

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