石管 Stone canal，sand canal，madreporic tube，madreporic canal

互联网2013-11-15

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　　系棘皮动物之水管系中连接筛板和环管的管，一般因壁内含钙而坚硬，故有此名。但海胆等亦有完全不含钙的种类（紫海胆）。海参仅含极微小的小骨片。石管周围为轴器所包。

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