A fragment of a Primnoidae colony (genus Narella) under a microscope showing three pairs of polyps. The polyps, curled downward against the main axis, are encased in plate-like sclerites.
Polyps
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 MB).
A fragment of a Primnoidae colony (genus Narella) under a microscope showing three pairs of polyps. The polyps, curled downward against the main axis, are encased in plate-like sclerites.
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