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约130年来,恐龙一直被分为两大演化分支:骨盆与鸟类相似的鸟臀目恐龙,以及骨盆与爬行动物相似的蜥臀目恐龙。鸟臀目恐龙包括禽龙等鸟脚亚目恐龙,以及三角龙和剑龙等有甲恐龙;蜥臀目恐龙包括霸王龙等肉食性的兽脚亚目恐龙,以及梁龙等巨大的蜥脚下目恐龙。然而,近期英国剑桥大学研究者研究了大量早期恐龙,包括74个分类群,共分析了457种特征,以检测解剖学上的相似性和差异。根据继承
For about 130 years, the dinosaurs have been divided into two evolutionary branches: the bird-hip-billed dinosaur with pelvis similar to birds, and the lizard-billed dinosaur with pelvis similar to reptiles. Birds hip head dinosaurs, including birds and other bird foot dinosaurs dinosaurs, as well as Triceratops and Stegosaurus and other dinosaur; lizard hip dinosaur, including Tyrannosaurus and other carnivores of theropod dinosaurs, as well as the giant dragon and other dragon feet Head dinosaur. However, a large number of early dinosaurs, including 74 taxa, were recently studied by researchers at the University of Cambridge in the United Kingdom. A total of 457 features were analyzed to detect anatomical similarities and differences. According to inheritance