Calcareous sponge

Rarity: Rare

A topic known well beyond its field, found in many languages.

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At a glance

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What Wikipedia says

The calcareous sponges or calcereans are sponges that make up the class Calcarea, characterized by spicules made of calcium carbonate in the form of high-magnesium calcite or aragonite.

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

Image: Ernst Haeckel, Public domain, via Wikimedia Commons.