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提起中生代,人们的头脑中往往会闪现出这样一幅景象:高大茂密的桫椤林中,成群的草食性恐龙漫步觅食,凶猛的霸王龙在远处窥视,伺机扑猎;天空中三三两两的翼龙滑翔游弋;浩瀚的大海里,各种各样的鱼龙时时跃出水面,追逐猎物。这些远古爬行动物统治着地球上的陆地、天空和海洋。但是,确切地说,这里描绘的仅仅是中生代中、晚期的地球生态系统,如果我们把目光投向更早的三叠纪,就会发现一幅截然不同的画面。那时候,恐龙只有母鸡一般大小,翼龙刚刚学会飞翔,鱼龙也是才出现不久,且只能在近海活动。除了这些刚刚诞生的掠食动物以外,地球上还生活着另外一种凶猛的肉食动物——初龙类,这种三叠纪的爬行动物是恐龙(包括鸟类)、翼龙以及鳄鱼的共同祖先。初龙类属种繁多,体形大小不一,有些种类成为当时的终极杀手。
Mentioning the Mesozoic, the minds of men often flashed a scene like this: tall and dense forest of Tarsus, groups of herbivorous dinosaurs walking foraging, fierce Tyrannosaurus rex in the distance, opportunistic hunting; twos and threes in the sky Pterosaur gliding cruise; the vast sea, a variety of fish from time to time out of the water, chasing prey. These ancient reptiles dominate the earth, the sky and the sea. But, to be more precise, the Mesozoic and Late Mesozoic Ecosystems depicted here are all but quite different if we turn our attention to the earlier Triassic. At that time, dinosaurs were only the size of hens, pterosaurs just learned to fly, the dragon is also only appeared soon, and can only be in the vicinity of the sea activities. In addition to these newly born predators, another ferocious carnivore, the Chironosaurus, is also found on this earth. This Triassic reptile is a common form of dinosaurs (including birds), pterosaurs and crocodiles ancestor. There are a lot of dragon species, body sizes, some species became the ultimate killer.