海星纲有棘目长棘海星科中的单型属和单型种。个体大，辐径可达20厘米，腕9～20个，一般13～15个。反口面骨板间隔很宽，各板有一个长棘，棘下部有柄，棘上端十分尖锐。腕外端棘特别发达，长可达45～50毫米 。筛板6～8个 。全体红色 。栖息于印度洋-西太平洋区热带珊瑚礁环境，以石珊瑚水螅体为食。破坏珊瑚礁海岸。刺冠海星的天敌是法螺。刺冠海星是一种有毒的动物，人被棘刺后常生剧痛。
一只棘冠海星每年可以吃掉5到6平方米的珊瑚虫。
A single Acanthaster can consume five to six square meters of coral polyps per year.
棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。
The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.
很难理解捕食减少是如何导致在特定年份的同一时间内，几个地方的棘冠海星数量突然增加。
It is difficult to understand how reduced predation would lead to sudden increases in Acanthaster numbers in several places at the same time in specific years.
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