Diogenes heteropsammicola is a species of hermit crab that lives within "walking corals" of the genera Heterocyathus and Heteropsammia.http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0184311 — or the DOI — 10.1371/journal.pone.0184311. (If it was a book, you could use the ISBN.)
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. 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.http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0184311 — or the DOI — 10.1371/journal.pone.0184311. (If it was a book, you could use the ISBN.)