We saw several growth stages of the sea pen, Umbellula, anchored in sediment patches.
Sea Pen
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 1.2 MB).

We saw several growth stages of the Sea Pen, Umbellula, anchored in sediment patches. This one is a young colony.

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