Echinoderm

Rarity: Rare

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

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What Wikipedia says

An echinoderm () is any animal of the phylum Echinodermata (), which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies".

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

Image: Auteur inconnu, Public domain, via Wikimedia Commons.