而海绵类、珊瑚类和腕足类动物则做不到这一点。

Sponges, corals and brachiopods, however, cannot do this.

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在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。

During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.

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该假说将圆环类动物与软体动物和腕足动物归为另一类，冠轮动物。

This hypothesis groups annelids with mollusks and brachiopods in another superphylum, Lophotrochozoa.

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