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海星实际上是棘皮动物，和海胆和饼海胆是近亲。
Popularlyknown as starfish, sea stars are actually echinoderms, closely relatedto sea urchins and sand dollars.
举例来说，棘皮动物传送到海底的碳明显比有孔虫多。
But echinoderms apparently deliver more carbon to the sediments than do forams, for example.
海胆：一种属于海胆纲的棘皮动物，包括沙钱和海胆。
Echinoid: an echinoderm of the class echinoidea which includes the sand dollars and sea urchins.
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