脊椎动物
脊椎动物亚门是脊索动物门下个一个亚门。拉丁文学名是Vertebrata，词根是“vertebra”，意为脊椎骨。目前所知最早个脊椎动物是中国云南省昆明发现个丰娇昆明鱼，距今约5.3亿年前。
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