User:RicardoA350I/citing sources

"Diogenes heteropsammicola is a species of hermit crab that lives within 'walking corals' of the genera Heterocyathus and Heteropsammia."

These coral have an internal cavity that is typically occupied by a symbiotic sipunculan worm; in the crab's habitat in the Ōshima Straight south of Amami Ōshima, it is often found inside the corals instead.