crinoid bed
... crinkling 微褶皱 Crinoid bed 海百合层 crinoid ossicle 海百合骨板 ...
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像海星一样，海百合也有五条或者更多条长腕，还有一个由钙化层整齐排列在一起的外壳。
Like their sea star cousins, crinoids have five or more arms and askeleton constructed of calcified plates elaborately slotted together.
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