However, fossil record indicate that not only most phyla of animals make their appearance at the very beginning of Cambrian, there are also many of body plans not extending to the later era.

• 而化石记录表明，不仅绝大多数动物门类在早寒武就已出现，而且早寒武世还有相当一部分类别由于绝灭而未能延续到其后的地质时代。