User:Sabian14/citing sources

Diogenes heteropsammicola is a species of hermit crab that lives within "walking corals" of the genera Heterocyathus and Heteropsammia. As of right now, they have only been found in Oshima Strait, between Kakeroma Island and Amami-Oshima Island, Kagoshima, Japan.

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