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Thick-walled Sponge
This thick-walled sponge of the family Corallistidae had a diameter of roughly 15 centimeters (6 inches). The specimen was collected at a depth of 140 meters (459 feet) during the Exploring the Blue Economy Biotechnology Potential of Deepwater Habitats expedition.
Credit

Image courtesy of Exploring the Blue Economy Biotechnology Potential of Deepwater Habitats.