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



In the Ōshima Strait ecosystem south of Amami Ōshima, instead of hosting symbiotic sipunculan worms as usual, these coral species frequently harbor crabs within their internal cavities.

In the intricate marine ecosystem of the Ōshima Strait, located to the south of Amami Ōshima, an intriguing ecological phenomenon unfolds within the vibrant coral colonies that dot the underwater landscape. These corals, typically known to provide shelter for symbiotic sipunculan worms within their internal cavities, deviate from the norm in this specific habitat. Instead of housing these worm partners, they often serve as refuge for crabs.

This peculiar adaptation raises questions about the dynamics of symbiosis and competition within this marine environment. What factors drive the crabs to seek shelter within the coral colonies? Is it a strategic move to avoid predators, or perhaps an opportunistic exploitation of an available resource? Conversely, what implications does this shift in occupancy have on the sipunculan worms, which have coevolved with the corals for mutual benefit?

Understanding the intricacies of this relationship sheds light on the complex web of interactions that shape marine ecosystems. It highlights the adaptability of organisms in response to their environment and underscores the need for comprehensive ecological studies to unravel the mysteries of the underwater world.