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2017年3月22日发表在《自然》杂志上的一项研究声称,长期以来人们将恐龙分为鸟臀目(如剑龙)和与之相对应的蜥臀目(如腕龙和霸王龙),而这种分类以后恐将不再适用。在其他众多的对恐龙家族系谱提出的改变建议中,长颈食草性恐龙和体型庞大的蜥脚类恐龙(如腕龙),与两足食肉性兽脚类恐龙(如霸王龙)之间的关系也不再像之前的分类中那样密切了。托马斯·霍尔茨,马里兰大学帕克分校一名研究脊椎动物
A study published in the March 22, 2017 issue of Nature claims that dinosaurs have long been classified as bird-nosed (Stegosaurus) and its corresponding lizard (eg Brachiosaurus and Tyrannosaur) ), And fear of this classification will no longer apply. Among the many other proposed changes to the pedigree of the dinosaur family, there is a link between the long-necked herbivore dinosaurs and the large sauropod dinosaurs (such as brachiosaurus) and the two-legged carnivore (eg Tyrannosaurus rex) The relationship is no longer as close as in the previous classification. Thomas Holtz, a University of Maryland-Parker study of vertebrates