1·Amphioxus, a cephalochordate, is an important model for studies of evolution and comparative biology.
文昌鱼是研究进化和比较生物学的重要模式生物。
2·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。