Chaetopteridae

Rarity: Common

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What Wikipedia says

The Chaetopteridae are a family of marine filter-feeding polychaete worms that live in vertical or U-shaped tubes in tunnels buried in the sedimentary or hard substrate of marine environments. The worms are highly adapted to the hard tube they secrete.

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

Image: Brehms Thierleben. Allgemeine Kunde des Thierreichs, Neunter Band, Vierte Abtheilung: Wirbellose Thiere, Zweiter Band: Die Niederen Thiere, Von Oscar Schmidt, Zweite umgearbeitete und vermehrte Auflage, Kolorirte Ausgabe, Leipzig: Verlag des Bibliographischen Instituts, 1887, Public domain, via Wikimedia Commons.