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Xing L.,China University of Geosciences | Xing L.,Chinese Academy of Sciences | Xing L.,University of Alberta | Persons W.S.,University of Alberta | And 6 more authors.

The largest specimen of the four-winged dromaeosaurid dinosaur Microraptor gui includes preserved gut contents. Previous reports of gut contents and considerations of functional morphology have indicated that Microraptor hunted in an arboreal environment. The new specimen demonstrates that this was not strictly the case, and offers unique insights into the ecology of nonavian dinosaurs early in the evolution of flight. The preserved gut contents are composed of teleost fish remains. Several morphological adaptations of Microraptor are identified as consistent with a partially piscivorous diet, including dentition with reduced serrations and forward projecting teeth on the anterior of the dentary. The feeding habits of Microraptor can now be understood better than that of any other carnivorous nonavian dinosaur, and Microraptor appears to have been an opportunistic and generalist feeder, able to exploit the most common prey in both the arboreal and aquatic microhabitats of the Early Cretaceous Jehol ecosystem. © 2013 The Society for the Study of Evolution. Source

Murray A.M.,University of Alberta | Xing L.,China University of Geosciences | Divay J.,University of Alberta | Liu J.,University of Alberta | And 2 more authors.
Journal of Vertebrate Paleontology

A new ginglymodian fish Beiduyu qijiangensis, gen. et sp. nov., is described from the freshwater Upper Jurassic Suining Formation of Chongqing, China. Although the fish is not completely preserved, it is most similar to Lepidotes and Scheenstia, which were once considered to be members of the Semionotiformes but are currently considered to be basal members of the Lepisosteiformes. The new fish lacks the strong dorsal ridge scales found in the Semionotiformes but has other features such as ganoid scales with anterodorsal and anteroventral processes but a reduced dorsal peg found in these basal lepisosteiform genera. With the description of this new taxon, there are three distinct ginglymodian fishes now known from southern China, all of them from Sichuan Province. © 2015 by the Society of Vertebrate Paleontology. Source

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