Fire Urchin (Asthenosoma varium)
…a species of fire urchin found throughout the Indo-Pacific, ranging from the Red Sea to Australia and Southern Japan. True to its name the fire urchin has venom tipped spines which can inflict a extremely painful sting on a potential predator or an unwary diver. This sting is nonlethal but can last for a couple of hours, causing a pain similar to being burned. The fire urchin is often seen with a commensal passenger (usually P.colemani or Z.adamsii) which feeds on passing food items that fall on the urchin.