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ABSTRACT
We report a new enantiornithine bird, Linyiornis amoena gen. et sp. nov., from the Lower Cretaceous Jiufotang Formation in northeastern China. Traces of ovarian follicles indicate that the specimen represents a female individual. The nearly three-dimensional preservation of the new specimen reveals morphological details rarely visible in other Early Cretaceous enantiornithines, allowing more detailed comparison with Late Cretaceous enantiornithines. Differences in the preserved morphology of the right and left coracoids suggest that the appearance of some features is strongly affected by preservation, indicating that the distribution of these features in compressed specimens may need to be reevaluated. Like Late Cretaceous enantiornithine specimens, the holotype of Linyiornis amoena preserves a hypertrophied pit for muscle attachment on the bicipital crest but clearly did not preserve a fossa for the capital ligament, present in Late Cretaceous taxa; we discuss the functional morphology and implications of these features in Linyiornis amoena.
http://zoobank.org/urn:lsid:zoobank.org:pub:EFFD4348-7376-4201-A948-CEC686E2E0DC
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Citation for this article: Wang, Y., M. Wang, J. K. O'Connor, X. Wang, X. Zheng, and X. Zhang. 2016. A new Jehol enantiornithine bird with three-dimensional preservation and ovarian follicles. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2015.1054496.
ACKNOWLEDGMENTS
We thank D.H. Li for preparing the specimen and J. Zhang for photographing. We also thank Z.H. Zhou for discussion and commenting on the article. We thank Editor T. Worthy and one anonymous reviewer for their constructive comments to improve this article. This project is supported by the National Basic Research Program of China (973 Program, 2012CB821906), National Natural Science Foundation of China (41502002, 41172020, 41372014, and 41402017), State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS, No.133115), National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China (J1210008), and Science and Technology Development Plan Project of Linyi (201312024).