Ji Qiang, Ji Shu-An, Cheng Yen-Nien, You Hai-Lu, Lü Jun-Chang, Liu Yong-Qing, Yuan Chong-Xi
Department of Earth Sciences, Nanjing University, Nanjing 210093, China.
Nature. 2004 Dec 2;432(7017):572. doi: 10.1038/432572a.
The recent discovery of a pterosaur egg with embryonic skeleton and soft tissues from the Yixian Formation confirmed that the flying pterosaurs were oviparous. Here we describe another pterosaur egg whose exquisite preservation indicates that the shell structure was soft and leathery.
最近在义县组发现的一枚带有胚胎骨骼和软组织的翼龙蛋证实了会飞的翼龙是卵生的。在此，我们描述另一枚翼龙蛋，其精美的保存状态表明蛋壳结构柔软且呈革质。
