Florida Deep Coral Expedition 2005. A hexactinellid sponge. Small juvenile amphipods enter the sponge and become captive as they grow too large to escape from inside the sponge's chambers.

Image ID: expl1150, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Credit: Image courtesy of Brooke et al, NOAA-OE, HBOI.

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