An enteropneust (or acorn worm) leaving a characteristic fecal coil on the seafloor in Sirena Canyon.
Enteropneust
Image courtesy of the NOAA Office of Ocean Exploration and Research, 2016 Deepwater Exploration of the Marianas. Download larger version (jpg, 1.5 MB).

An enteropneust (or acorn worm) leaving a characteristic fecal coil on the seafloor in Sirena Canyon.

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