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White Sponge With Zoanthids
A thick, flat, white sponge (Petrosiidae) with gray zoanthids on it seen off northwestern Puerto Rico at a depth of 109 meters (358 feet) during Exploration of Deepwater Habitats off Puerto Rico and the U.S. Virgin Islands for Biotechnology Potential.
Credit

Image courtesy of Exploration of Deepwater Habitats off Puerto Rico and the U.S. Virgin Islands for Biotechnology Potential.