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ostracoderms
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ostracoderms
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无颌类
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ostracoderms
甲胄鱼类
一类处于七鳃鳗类和有颌类之间的化石无颌类,为并系类群。与具现生种的盲鳗类、七鳃鳗类在形态上完全不同,头部与身体披有甲胄或鳞片,故被称为“甲胄鱼类”。
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