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所有鸟臀目恐龙都是植食性或杂食性。鸟臀目恐龙中的奇异辽宁龙是一种体型很小的甲龙,以往均认为与其他甲龙一样生活在陆地上,主要以植物为食。报道了中国发现的一件新的奇异辽宁龙标本,该标本体腔内保存了很多鱼类化石骨骼,认为这些鱼类残骸是甲龙胃或肠里的残留物,因此可以作为该恐龙食肉的有力证据。奇异辽宁龙颊齿齿冠具有长而分叉的齿饰,这种齿系可以穿透像鱼类一样的小动物。恐龙前、后肢指(趾)爪演变得非常锋利同样可以证明其适应吃肉的生活方式。奇异辽宁龙腹部甲板演化成盾状及荐骨-腰带关联疏松也说明其适应水生生活,腹部甲板可以保护腹部身体免受水下攻击。同理,神经弓与椎体之间缝合线开阔不能再作为正型标本的幼年特征。奇异辽宁龙是自18世纪发现恐龙以来已知的第一种肉食性鸟臀目恐龙,不仅代表了第一种水生或半水生有甲类恐龙,更是目前已知最小的鸟臀目恐龙。
All bird-hip dinosaurs are herbivorous or omnivorous. The peculiar Liaoning dragon in the bird-hip-head dinosaurs is a small ankylosaur that in the past was thought to live on land as the other ankylosaurs. It mainly feeds on plants. Reported a new exotic Liaoning dragon specimen found in China, which contains many fish fossil bones in the body cavity and considers that the remains of the fish are the remains of the Aphrodisiac or intestine and therefore can serve as a powerful force in the carnivore of the dinosaur evidence. Liaoning dragon cheek tooth crown with long and bifurcated tooth decoration, this tooth system can penetrate like fish like animals. Before and after the dinosaur, the claw of the hind limbs became very sharp and could also prove its adaptation to the meat-eating lifestyle. The evolution of the bizarre Liaoning abdomen’s decks into shield-like and sacral-bodily-belt looseness also indicates that it adapts to aquatic life and the abdominal deck protects the abdomen from underwater attacks. Similarly, the open suture between the nerve arch and the vertebral body can no longer serve as a positive feature of childhood specimens. The exotic dinosaur, the first carnivorous bird-billed dinosaur known since the discovery of dinosaurs in the 18th century, represents not only the first aquatic or semi-aquatic dinosaur A but also the smallest known bird hip dinosaur.