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鸟胸类
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鸟纲(化石)
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鸟胸类
一类种类数量很大、具有同一祖先且来源于基干鸟类的鸟类群。由反鸟类(Enantiornithes)和今鸟型类(Ornithuromorpha)构成,包括了中生代发现的大多数鸟类化石。
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