LIONEL, TIM & ALISTAIR / SCIENCE PHOTO LIBRARY LIONEL, TIM & ALISTAIR / SCIENCE PHOTO LIBRARY
Crown-of-thorns starfish spines. The crown-of- thorns starfish (Acanthaster planci) is covered in numerous spines that release poison into the skin of an attacker. A. planci is a large starfish with between 12 and 19 arms. Its mouth is on its underside, and it feeds on coral polyps. The increase in numbers of this starfish poses a serious threat to coral reefs. Photographed off the coast of Oman in the Arabian Sea.
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