Ascidiacea

Rarity: Rare

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

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What Wikipedia says

Ascidiacea, commonly known as the ascidians or sea squirts, is a paraphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer test or "tunic" made of the polysaccharide cellulose.

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

Image: Nhobgood Nick Hobgood, CC BY-SA 3.0, via Wikimedia Commons.