鸭嘴龙头饰的结构和功能研究

Summary on the Morphology and Function of the Cranial Crests of Hadrosaurid Dinosaurs

在漫长的距今约2．5亿年至6500万年前的中生代地质历史时期，作为爬行动物的恐龙最早出现在约2-3亿年前的三叠纪晚期，种类众多，分布广泛，是中生代陆地的霸主，中生代几乎就是恐龙的时代，它们最终于6500万年前的白垩纪末期绝灭，在这约1．7亿年中它们支配着全球的陆地生态系统。

Hadrosaurids are remarkable for their expanded rostra,jaws equipped with well-developed dental batteries and,in many species,conspicuous supracranial crests.There are various forms of morphology of the bizarre hollow cranial crests and the nasal cavities in the crests.This article summarizes the morphology of the cranial crests,the nasal cavities and the theories of crest function.Recent research progresses of the unique 'stick-shaped' crest of the Tsintaosaurus spinorhinus are also introduced.