Biddulphia sp., SEM

Biddulphia sp., SEM


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Coloured scanning electron micrograph (SEM) of marine centric diatom frustule (Biddulphia sp.). This species was found in the Pacific Ocean near the sea shore (Oahu, Hawaii). Biddulphia species typically form a light brown scum on seaweeds or rocks in the ocean. It also can form a scum on aquarium walls. Diatoms are microscopic, unicellular algae that are abundant in marine and fresh water. There are many phytoplankton diatom genera that are an important part of the food chain. The body or frustule is composed of two halves which fit tightly together. The cell walls contain silica dioxide (glass) which are preserved in deposits known as diatomaceous earth. Magnification: x260 when shortest axis printed at 25 millimetres.

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