SINCE 1828
Chaetopterus
noun
Chae·top·ter·us
Definition of Chaetopterus
: a genus (the type of the small family Chaetopteridae) of large marine polychaete worms that inhabit parchmentlike U-shaped tubes open at both ends, are highly bioluminescent, and have one pair of large lateral appendages and several broad fanlike membranous folds by which they maintain a current of water within the tube
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