Amphioxus represents the transitional type of animals from invertebrate to vertebrate.

文昌鱼代表由无脊椎动物进化到脊椎动物的过渡类型。

Amphioxus is becoming an emerging model organism for insights into the origin and evolution of vertebrates.

文昌鱼是研究脊椎动物起源与进化十分珍贵的模式动物。

In evolution, Amphioxus, a cephalochordate, has been regarded as the living fossil closest to the vertebrates.

在进化中，头索动物文昌鱼被认为是接近于脊椎动物的活化石。

Amphioxus, a cephalochordate, widely considered as the closest living invertebrate relatives of the vertebrates.

头索动物文昌鱼代表从无脊椎动物到脊椎动物进化过程中一个重要的过渡阶段。