Coscinodiscophyceae

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What Wikipedia says

The Coscinodiscophyceae are a class of diatoms. They are similar to the Centrales, a traditional, paraphyletic subdivision of the heterokont algae known as diatoms. The order is named for the shape of the cell walls (or valves or frustules) of centric diatoms, which are circular or ellipsoid in valve view.

Excerpt from the Wikipedia article “Coscinodiscophyceae”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jmpost, CC BY-SA 3.0, via Wikimedia Commons.