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Abstract
Dromaeosaurids were bird-like dinosaurs with a predatory ecology known to forage on fish, mammals and other dinosaurs. We describe Daurlong wangi gen. et sp. nov., a dromaeosaurid from the Lower Cretaceous Jehol Biota of Inner Mongolia, China. Exceptional preservation in this specimen includes a large bluish layer in the abdomen which represents one of the few occurrences of intestinal remnants among non-avian dinosaurs. Phylogenetically, Daurlong nests among a lineage of short-armed Jehol Biota species closer to eudromaeosaurs than microraptorines. The topographic correspondence between the exceptionally preserved intestine in the more stem-ward Scipionyx and the remnants in the more birdlike Daurlong provides a phylogenetic framework for inferring intestine tract extent in other theropods lacking fossilized visceral tissues. Gastrointestinal organization results conservative among faunivorous dinosaurs, with the evolution of a bird-like alimentary canal restricted to avialan theropods.
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Details
1 Chinese Academy of Geological Sciences, Key Laboratory of Stratigraphy and Paleontology of the Ministry of Natural Resources, Institute of Geology, Beijing, China (GRID:grid.418538.3) (ISNI:0000 0001 0286 4257)
2 Unaffiliated, Parma, Italy (GRID:grid.418538.3)
3 Inner Mongolia Museum of Natural History, Huhhot, China (GRID:grid.418538.3)
4 China University of Geosciences, Beijing, China (GRID:grid.162107.3) (ISNI:0000 0001 2156 409X)