title: Palaeontology: pterosaur egg with a leathery shell.
abstract: 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.
authors.affiliation: Department of Earth Sciences, Nanjing University, Nanjing 210093, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ji
authors.forename: Shu-An
authors.initials: SA
authors.lastname: Ji
authors.forename: Yen-Nien
authors.initials: YN
authors.lastname: Cheng
authors.forename: Hai-Lu
authors.initials: HL
authors.lastname: You
authors.forename: Jun-Chang
authors.initials: JC
authors.lastname: Lü
authors.forename: Yong-Qing
authors.initials: YQ
authors.lastname: Liu
authors.forename: Chong-Xi
authors.initials: CX
authors.lastname: Yuan
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000033:anatomy & histology; D002681:China; D025061:Dinosaurs / Q000033:anatomy & histology* / Q000196:embryology*; D004528:Egg Shell / Q000033:anatomy & histology* / Q000737:chemistry*; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology* / Q000196:embryology*; D005580:Fossils; D049690:History, Ancient; D014921:Wings, Animal / Q000033:anatomy & histology