Acanthaster planci, commonly known as the crown-of-thorns starfish, is a large, multiple-armed starfish (or seastar) that usually preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns receives its name from venomous thorn-like spines that cover its upper surface. It is the second-largest sea star in the world...A. planci has a very wide Indo-Pacific distribution. It occurs at tropical and subtropical latitudes from the Red Sea and the east African coast across the Pacific Ocean, across the Indian Ocean to the west coast of Central America. It occurs where coral reefs or hard coral communities occur in this region..
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