桡足动物是小甲壳动物。

Copepods are small crustaceans.

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桡足动物任一种桡足亚纲的大量海洋或淡水甲壳纲小动物，身体细长，尾部分叉。

Any of numerous minute Marine and freshwater crustaceans of the subclass Copepoda, having an elongated body and a forked tail.

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小型无脊椎动物也是克里普斯海洋研究所的收藏对象，其数量足有上亿种，上图中的桡足类(copepod)样本仅是其中的一小部分。

Small invertebrates make up yet another collection at Scripps. The copepods above are just a few of 100 million crumb-sized creatures in the collection.

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