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20 鸟纲( Aves ) PowerPoint PPT Presentation


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20 鸟纲( Aves ). 一、鸟纲的进化地位. 鸟纲概述. 1. 现存的鸟纲动物是古代鸟纲动物的后代;. 2. 古鸟 类是 1.8 亿年前 由比较高等的古爬行类(假腭类)进化而来;. 3. 鸟 类和爬行类都是双颞窝类的后裔,所以鸟类和爬行 类很多相似的特征,如皮肤干燥,缺乏腺体;单一的枕骨髁;排泄物是尿酸等。. 4. 鸟 类是 脊椎动物中的第二大类,约有 9700 种,广泛分布于地球。. 5. 鸟类是被羽 , 有翼 , 恒温卵生适应飞行生活的高等脊椎动物。. 二、鸟纲的特征概述. 鸟纲动物概述.

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20 鸟纲( Aves )

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