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Sponge and crinoids

This white deep-sea sponge is about one meter (three feet) across. It was photographed by MBARI's remotely operated vehicle Tiburon on the crest of Pioneer Seamount, about 100 kilometers (65 miles) southwest of San Francisco and 1,600 meters (one mile) below the ocean surface. Clinging to the sponge are dozens of feathery orange crinoids, which perch above the sea floor, capturing tiny food particles that drift by on deep-ocean currents.

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