Larvacean

Rarity: Rare

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

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What Wikipedia says

Larvaceans, copelates or appendicularians, class Appendicularia, are solitary, free-swimming tunicates found throughout the world's oceans. While larvaceans are filter feeders like most other tunicates, they keep their tadpole-like shape as adults, with the notochord running through the tail.

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

Image: Dr. Thomas Clarke RedEnsign at English Wikipedia, CC BY 2.5, via Wikimedia Commons.