Chaetopterus aduncus is a species of parchment worm, a marine polychaete in the family Chaetopteridae.
Description Chaetopterus aduncus differs from C. charlesdarwinii and C. galapagensis in having 10-11 anterior region chaetigers, a J-shaped tube with one blind end, and prominent dorsal bulbous inflations in the anterior region chaetigers.
Distribution Chaetopterus aduncus is endemic to the Galapagos Islands.
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