Chaetopterus pacificus is a species of parchment worm, a marine polychaete in the family Chaetopteridae.
Description and biology Chaetopterus pacificus is known from sandy bottoms from the Izu Peninsula to the Boso Peninsula, in central Japan. It is distinct in having an extended flip-like peristomium, a higher number (11-12) of chaetigers (chitinous bristle) in the anterior region, and a U-shaped tube.
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