Contact Reactions between Individuals of the Coral-killing sponge, .

Outbreaks of the coral-killing sponge Rützler and Muzik, 1993 have become a threat to corals and result in coral reef deterioration. This species has an increasing distribution in the Indo-Pacific Ocean and thrives in patches on some reefs in Okinawa, Japan. However, the dispersal process and mechanisms involved remain unknown.

Snails associated with the coral-killing sponge Terpios hoshinota in Okinawa Island, Japan.

Terpios hoshinota is a thin encrusting sponge that overgrows live scleractinian corals and it is linked to coral loss in many reefs. However, our knowledge of the species associated with this sponge species is poor. During a periodical survey of T.