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Thalassionema

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Thalassionema

This star-shaped colony of marine diatoms is called Thalassionema. Diatoms are single-celled algae and some of the most numerous photosynthetic “plants” in the oceans. Hundreds of diatoms can fit on the head of a pin, but these tiny organisms exist in countless numbers—enough to change seawater color during periodic population “blooms.”
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