中龙类（Broom, 1913）是一群已灭绝的爬行动物。它们生活在大约3.2亿到2.8亿年前的早二叠纪的海中。它们是最早的水栖爬行动物，在陆地上演化过后再度返回水中。
在另一方面，我们从类似鸟类或速龙类这样的密切相关的物种中可以找到类似的改变(不过没有巴拉乌尔龙这样的程度)。
On the other hand, we see similar modifications (even if not to the extent seen in Balaur) in relatively closely related taxa such as birds or Velociraptor.
另一个则是蜥龙类，其中有很出名的梁龙和暴龙，同时蜥龙类中也有鸟类的直系祖先。
The other is the Saurischia, whose famous members include Diplodocus and Tyrannosaurus. The Saurischia also include all the immediate ancestors of birds.
狮子不像龙、凤一类神禽异兽，作为皇家专利，只出现在宫廷艺术的造型中收藏。
Figures of the lion were not used exclusively by the royal families in imperial arts as were the dragon and the phoenix.
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