Hadrosauroid eggs and embryos from the Upper Cretaceous (Maastrichtian) of Jiangxi Province, China

Author:

Xing Lida,Niu Kecheng,Yang Tzu-Ruei,Wang Donghao,Miyashita Tetsuto,Mallon Jordan C.

Abstract

Abstract Background Dinosaur eggs containing embryos are rare, limiting our understanding of dinosaur development. Recently, a clutch of subspherical dinosaur eggs was discovered while blasting for a construction project in the Upper Cretaceous red beds (Hekou Formation) of the Ganzhou Basin, Jiangxi Province, China. At least two of the eggs contain identifiable hadrosauroid embryos, described here for the first time. Results The eggs, attributable to Spheroolithidae indet., are thin-walled and small (~ 660 mL) compared to those of Lambeosaurinae. The shape of the embryonic squamosal is reminiscent of that seen in the Late Cretaceous hadrosauroids Levnesovia transoxiana, Tanius sinensis, and Nanningosaurus dashiensis, suggestive of possible affinities. Conclusion The small size of the eggs and embryos, similar to those of Hadrosaurinae, indicates that the larger eggs and hatchlings typical of Lambeosaurinae are evolutionarily derived.

Funder

National Natural Science Foundation of China

111 Project

Fundamental Research Funds for the Central Universities

Ministry of Science and Technology, Taiwan

Natural Sciences and Engineering Research Council of Canada

Canadian Museum of Nature

Publisher

Springer Science and Business Media LLC

Subject

General Medicine

Reference58 articles.

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