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Diogenes heteropsammicola is a species of hermit crab that lives within "walking corals" of the genera Heterocyathus and Heteropsammia. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0184311



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.

References:
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0184311