n. brachiopod
而海绵类、珊瑚类和腕足类动物则做不到这一点。
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.
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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