“cephalochordate”的概念、定义、翻译、参考文献-科学参考

单词	cephalochordate
释义	cephalochordate Encyclopedia 理学头索动物释 cephalochordate 头索动物现存最原始的脊索动物，位于脊索动物系统树基部。头索动物无真正的头，习惯也称无头类，脊索纵贯全身，向前一直延伸到身体背神经管的前方，这在所有脊索动物是仅有的现象，故而被称为头索动物。 Biology cephalochordate头索动物
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