Aspect: |
Looks like a single (no branches) barbed wire winding its way up into the water. The "barb" is in fact a dense pattern of radially deployed polyps along the central structure of this black coral.
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Population: |
Common, usually on the slopes of deep-plunging reefs.
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Notable feature: |
Looks dark overall, but under flashlight reveals a brown or orange stem form which a continuous stream of white polyps radially protrudes.
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Environment: |
Generally along reef slopes from 20 metres on.
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Behaviour: |
Polyps retract if accidentally touched.
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