The first dinosaurs from the Early Cretaceous Hami Pterosaur Fauna, China

Author:

Wang Xiaolin,Bandeira Kamila L. N.,Qiu Rui,Jiang Shunxing,Cheng Xin,Ma Yingxia,Kellner Alexander W. A.

Abstract

AbstractThe Early Cretaceous Hami Pterosaur Fauna in Northwest China preserves a large number of specimens of the sexually dimorphic pteranodontoid pterosaur Hamipterus tianshanensis, including 3D eggs and embryos. During the last decade, several more fossils have been collected in this area, including three somphospondylan sauropod specimens. The first is Silutitan sinensis gen. et sp. nov., which consists of an articulated middle to posterior cervical vertebrae series. The second, Hamititan xinjiangensis gen. et sp. nov., consists of an incomplete articulated caudal sequence that could be assigned to lithostrotian titanosaurs based on the strongly procoelous caudal vertebrae with lateral concave surface, as well as marked ventrolateral ridges. The third specimen consists of four sacral vertebral elements, apparently unfused, with exposed camellate internal bone and regarded as somphospondylan. Cladistic analyses based on different datasets recovered Silutitan sinensis as an euhelopodid closely related to Euhelopus and Hamititan xinjiangensis as a titanosaur. Besides the pterosaur Hamipterus and one theropod tooth, these dinosaurs are the first vertebrates reported in this region, increasing the diversity of the fauna as well as the information on Chinese sauropods, further supporting a widespread diversification of somphospondylans during the Early Cretaceous of Asia.

Funder

National Natural Science Foundation of China

the Strategic Priority Research Program (B) of CAS

Excavation Funding and Emphatic Deployed Project of IVPP, CAS

Cooperation Project with Hami Government

Fundação de Desenvolvimento Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Youth Innovation Promotion Association of the Chinese Academy of Sciences

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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