1.【动】文昌鱼
1.a small slender translucent animal living in the ocean that is related to the ancestors of all vertebrate animals and lives buried in sand.
1.Photo: A lancelet, a close relative of vertebrates, in several stages of decay. credit: University of Leicester
图片:脊椎动物的近亲,一只文昌鱼腐烂过程的几个阶段。