一个9000万年的阿根廷恐龙化石 揭示了阿尔瓦雷斯索尔斯在 特殊性格之前 规模很小的进化, 挑战了 早先关于他们的饮食和来源的假设。 A 90-million-year-old Argentine dinosaur fossil reveals alvarezsaurs evolved small size before specialized traits, challenging earlier assumptions about their diet and origins.

来自阿根廷巴塔哥尼亚(Patagonia)的一只鸡头大小的恐龙Alnashetri Cerropolidienisis(Alnashetri Cerropolidienis)的近9 000万年前的化石正在改变对Alvarezsaur进化过程的理解。 A nearly complete 90-million-year-old fossil of Alnashetri cerropoliciensis, a chicken-sized dinosaur from Patagonia, Argentina, is reshaping understanding of alvarezsaur evolution. 在La Buitrera现场发现,保存精良的标本(小于两磅)有长的手臂和大牙齿,表明小体积在像一只拇指爪这样的专门特征之前就已经演变。 Found at the La Buitrera site, the well-preserved specimen—weighing less than two pounds—had long arms and larger teeth, indicating that small body size evolved before specialized features like a single thumb claw. 这种认为Alvarezsaurs总是食不果腹的观念提出了挑战,并表明它们比想象的要早多样化,可能起源于潘加亚时代,随着大陆的漂移而蔓延。 This challenges the idea that alvarezsaurs were always ant-eaters and suggests they diversified earlier than thought, likely originating during the Pangaea era and spreading as continents drifted. 这项由Peter Makovicky领导的发现发表在"自然"杂志上, 突出了该群体复杂的进化路径, 并证实它们是非鸟类类的类动物, 而不是鸟类的祖先. The discovery, led by Peter Makovicky and published in Nature, highlights the group’s complex evolutionary path and confirms they were non-avian theropods, not bird ancestors.