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Cup Sponge
A cup sponge with a squat lobster at its base seen off western Puerto Rico at a depth of 156 meters (512 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.