Multi-colored Serpulid or 'Christmas Tree Worm' (Spirobranchus giganteus) on a large Porites coral head.
Marion Reef, Coral Sea, Australia - Depth 35 feet or 9 meters

Life on the Shallow Reefs - Indo-Pacific Underwater Photography Gallery VII

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Life on the Shallow Reefs of Fiji and the Coral Sea

Indo-Pacific Underwater Photography Gallery VII