Implications of flexible-shelled eggs in a Cretaceous choristoderan   reptile

doi:10.1098/rspb.2009.2035

CORC > 北京大学 > 地球与空间科学学院

	Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile
	Hou, Lian-Hai ; Li, Pi-Peng ; Ksepka, Daniel T. ; Gao, Ke-Qin ; Norell, Mark A.
刊名	proceedings of the royal society b biological sciences
	2010
关键词	eggshell embryo paleontology fossil reptile DINOSAUR EGGS PHYLOGENETIC ANALYSIS EGGSHELLS EMBRYO CHINA DIAPSIDA AGE
DOI	10.1098/rspb.2009.2035
英文摘要	Flexible, or soft-shelled, eggs are almost unknown in the fossil record, leaving large gaps in our knowledge of the reproductive biology of many tetrapod clades. Here, we report two flexible-shelled eggs of the hyphalosaurid choristodere Hyphalosaurus baitaigouensis from the Early Cretaceous of China, one containing an embryo and the second associated with a neonate. Choristoderes are an enigmatic group of aquatic reptiles that survived the K-Textinction but died out in the Miocene. Hyphalosaurids, a specialized clade of Choristodera, resemble miniature plesiosaurs and are considered to be primarily aquatic in habit. Scanning electron microscopy of samples from the eggs reveals a thin, non-columnar external mineralized layer characterized by rounded nodes and tentatively identified poorly structured irregular pores, with an underlying amorphous layer presumably representing decomposed protein fibrils. While the relationships of Choristodera remain controversial, eggshell microstructure more closely resembles that of Lepidosauromorpha (the lineage including lizards) as opposed to that of Archosauromorpha (the lineage including birds and crocodiles).; Biology; Ecology; Evolutionary Biology; SCI(E); 4; ARTICLE; 1685; 1235-1239; 277
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/395762]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Hou, Lian-Hai,Li, Pi-Peng,Ksepka, Daniel T.,et al. Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile[J]. proceedings of the royal society b biological sciences,2010.
APA	Hou, Lian-Hai,Li, Pi-Peng,Ksepka, Daniel T.,Gao, Ke-Qin,&Norell, Mark A..(2010).Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile.proceedings of the royal society b biological sciences.
MLA	Hou, Lian-Hai,et al."Implications of flexible-shelled eggs in a Cretaceous choristoderan reptile".proceedings of the royal society b biological sciences (2010).