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Sponge With Black-Rimmed “Fingers”
A sponge with black-rimmed "fingers" (possibly Smenospongia conulosa) seen off southern Puerto Rico at a depth of 98 meters (322 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.