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Chicken-sized oviraptorid dinosaurs from central China and their ontogenetic implications

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Abstract

Oviraptorids are a group of specialized non-avian theropod dinosaurs that were generally one to 8 m in body length. New specimens of baby oviraptorids from the Late Cretaceous of Henan Province are some of the smallest individuals known. They include diagnostic characters such as the relative position of the antorbital fenestra and the external naris, distinct opening in the premaxilla anteroventral to the external naris, antorbital fossa partly bordered by premaxilla posterodorsally, lacrimal process of premaxilla does not contact the anterodorsal process of the lacrimal, parietal almost as long as frontal; in dorsal view, posterior margin forms a straight line between the postzygapophyses in each of the fourth and fifth cervicals; femur longer than ilium. They also elucidate the ontogenetic processes of oviraptorids, including fusion of cranial elements and changes in relative body proportions. Hind limb proportions are constant in oviraptorids, regardless of absolute body size or ontogenetic stage. This suggests a sedentary lifestyle that did not involve the pursuit of similar-sized prey. The functional implications for bite force and therefore dietary preferences are better understood through the study of such small animals. The comparison of the measurements of 115 skeletons indicates that oviraptorids maintain their hind limb proportions regardless of ontogenetic stage or absolute size, which is a pattern seen more commonly in herbivores than in carnivores. This may weakly support the hypothesis that oviraptorids are herbivores rather than active carnivores.

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Acknowledgments

We thank Yoshitsugu Kobayashi (Hokkaido University Museum, Hokkaido University, Japan) for making the thin section of the rib of HGM 41HIII-0107. Eva Koppelhus provided support for measuring and photographing the specimens. This study was supported by Natural Science Foundation of China grants (41272022; 40872017), and the study of dinosaur faunas from western and southern Henan Province (2006).

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Authors and Affiliations

  1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China

    Junchang Lü

  2. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada, T6G 2E9

    Philip J. Currie

  3. Henan Geological Museum, Zhengzhou, 450016, Henan Province, China

    Li Xu, Xingliao Zhang, Hanyong Pu & Songhai Jia

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  1. Junchang Lü
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  2. Philip J. Currie
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Correspondence to Junchang Lü.

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Communicated by: Robert Reisz

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Lü, J., Currie, P.J., Xu, L. et al. Chicken-sized oviraptorid dinosaurs from central China and their ontogenetic implications. Naturwissenschaften 100, 165–175 (2013). https://doi.org/10.1007/s00114-012-1007-0

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