中生代的鸟类主要包括三个大的类群:原始的基干鸟类和进化得更为成功的反鸟类、今鸟型类,后两类鸟也被统称为鸟胸类。目前发现的大多数中生代鸟类化石都属于鸟胸类,全球“有60多个属种”。但基干鸟类只有始祖鸟、热河鸟、孔子鸟和会鸟四大类群,不到10个属。据推测,这其中必然会有更多的中间类群,否则难以解释鸟胸类是如何从基干鸟类演化而来并迅速繁盛起来的。近期,研究者在早白垩世的热河生物群发现了一类新的基干鸟类化石,命名为“郑氏重明鸟”。从某种程度上说,重 The Mesozoic birds mainly consist of three major groups: the original trunk birds and more evolutionary anti-birds, the current bird type, the latter two types of birds are also collectively referred to as the birds and breeds. Most of the Mesozoic fossil birds found so far belong to the category of birds and bovines, and there are more than 60 genera in the world. However, there are only four major taxa of Archeopteryx, Jehol, Confucius, and Birdwatchers in less than 10 genera. Presumably, there will inevitably be more intermediate groups, otherwise it is hard to explain how the birds and bates have evolved from the basic birds and flourished rapidly. Recently, researchers discovered a new class of fossil-related bird fossils in the Early Cretaceous Jehol Biofilm, named as “Zhengshi Mingbird”. To some extent, heavy