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



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

References

https://www.nature.com/nature/research-articles?searchType=journalSearch&sort=PubDate&page=7