1. This hypothesis groups annelids with mollusks and brachiopods in another superphylum, Lophotrochozoa. 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。
2. Sponges, corals and brachiopods, however, cannot do this. 而海绵类、珊瑚类和腕足类动物则做不到这一点。
3. More than 90% of Permiangenera of sponges, corals and brachiopods vanished in the extinction. 高过百分之九十海绵类、珊瑚类以及腕足类生物在大灭绝中消失了。
4. This paper analysed the carbon and oxygen isotope composition of brachiopods fossils from the Devonian Period in Sichuan Province. 本论文对来自四川龙门山泥盆纪的腕足化石进行碳、氧同位素分析。
5. Shelly creatures such as trilobites and brachiopods, of whose ancestors there is little sign in the rocks, are suddenly everywhere. 像三叶虫和腕足类一样的贝壳类生物是谁的祖先在岩石中得到一点提示，这些东西到处都是。
