鸟类和两栖纲的无尾目在脊柱的末端，由数块尾椎愈合生成的骨。在鸟类成侧扁形（锄形）上着尾羽，无尾目的尾端骨呈柱状。

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尾综骨 pygostylus，urostylus，ploughsharebone

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