标题：Morphology of the late Cretaceous crocodylomorph Shamosuchus djadochtaensis and a discussion of neosuchian phylogeny as related to the origin of Eusuchia. (Bulletin of the American Museum of Natural History, no. 324)
期刊名称：Bulletin of the American Museum of Natural History
印刷版ISSN：0003-0090
电子版ISSN：1937-3546
出版年度：2009
卷号：1
出版社：American Museum of Natural History
摘要：We describe a new specimen of the fossil crocodyliform taxon Shamosuchus djadochtaensis from the late Cretaceous Djadokhta Formation. The new specimen consists of an almost complete skull found in association with postcranial material. Because it is considerably more complete than the holotype, the new specimen permits proper diagnosis of Shamosuchus djadochtaensis and offers new information for exploring its phylogenetic relationships. The phylogenetic analysis conducted here improves taxon sampling of neosuchian crocodyliforms with respect to previous approaches to crocodyliform systematics and reveals that Shamosuchus djadochtaensis bears important information toward an understanding of the relationships of advanced neosuchians and the evolutionary origin of Eusuchia. Shamosuchus djadochtaensis is found to be the sister group of Rugosuchus nonganensis, comprising an Asian clade diagnosed by the presence of a sagittal ridge on the dorsal surface of the frontal, confluent openings for...
