A tube anemone, a marine animal related to sea anemones that lives inside a mucus-lined tube on the seafloor.
From the genus Cerianthus + -id (member of a family). Cerianthus comes from Greek keros (wax) + anthos (flower), named for their wax-like tube homes and flower-like tentacles.
Cerianthids are the ultimate introverts of the ocean—they spend their entire lives in the same mucus tube they built, sticking out their tentacles to catch food but rarely venturing into open water.
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