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Jingmai K. O'Connor
Chinese Academy of Sciences
52Publications
22H-index
1,078Citations
Publications 52
Newest
Published on May 10, 2019in bioRxiv
Anyang Ding (HKU: University of Hong Kong), Michael Pittman9
Estimated H-index: 9
(HKU: University of Hong Kong)
+ 3 AuthorsXing Xu41
Estimated H-index: 41
ABSTRACT The Coelurosauria are a group of mostly feathered theropods that gave rise to birds, the only dinosaurs that survived the Cretaceous-Paleogene extinction event and are still found today. Between their first appearance in the Middle Jurassic up to the end Cretaceous, coelurosaurs were party to dramatic geographic changes on the Earth’s surface, including the breakup of the supercontinent Pangaea, and the formation of the Atlantic Ocean. These plate tectonic events are thought to have cau...
Published on May 2, 2019in PLOS Computational Biology
Yaser Saffar Talori (THU: Tsinghua University), Jing-Shan Zhao (THU: Tsinghua University)+ 3 AuthorsJingmai K. O'Connor22
Estimated H-index: 22
(CAS: Chinese Academy of Sciences)
The origin of avian flight is one of the most controversial debates in Paleontology. This paper investigates the wing performance of Caudipteryx, the most basal non-volant dinosaur with pennaceous feathered forelimbs by using modal effective mass theory. From a mechanical standpoint, the forced vibrations excited by hindlimb locomotion stimulate the movement of wings, creating a flapping-like motion in response. This shows that the origin of the avian flight stroke should lie in a completely nat...
Published on Jan 1, 2019in Palaeogeography, Palaeoclimatology, Palaeoecology2.62
Jingmai K. O'Connor22
Estimated H-index: 22
(CAS: Chinese Academy of Sciences)
Abstract Although direct associations that reveal diet are extremely rare in the fossil record, the rich Lower Cretaceous Jehol Lagerstatte has produced dozens of specimens preserving ingested items, which together reveal important information regarding the early evolution of the avian alimentary canal. Direct evidence indicates Jeholornis and Sapeornis ate seeds and like living granivores utilized a gastric mill although only the more derived Sapeornis possessed a crop for food storage. Despite...
Published on Dec 1, 2018in Scientific Reports4.01
Dana Rashid2
Estimated H-index: 2
(MSU: Montana State University),
Kevin Surya (MSU: Montana State University)+ 7 AuthorsJohn R. Horner41
Estimated H-index: 41
(MSU: Montana State University)
The avian tail played a critical role in the evolutionary transition from long- to short-tailed birds, yet its ontogeny in extant birds has largely been ignored. This deficit has hampered efforts to effectively identify intermediate species during the Mesozoic transition to short tails. Here we show that fusion of distal vertebrae into the pygostyle structure does not occur in extant birds until near skeletal maturity, and mineralization of vertebral processes also occurs long after hatching. Ev...
Published on Aug 16, 2018in bioRxiv
Jing-Shan Zhao (THU: Tsinghua University), Yaser Saffar Talori (THU: Tsinghua University)+ 1 AuthorsYaser Saffar Talori, Jing-Shan Zhao, Jingmai Kathleen O'Connor (THU: Tsinghua University)
This study seeks to better quantify the parameters that drove the evolution of flight from non-volant winged dinosaurs to modern birds. In order to explore this issue, we used fossil data to model the feathered forelimb of Caudipteryx, the most basal non-volant maniraptoran dinosaur with elongate pennaceous feathers that could be described as forming proto-wings. In order to quantify the limiting flight factors, we created three hypothetical wing profiles for Caudipteryx representing incremental...
Published on Apr 1, 2018in Cretaceous Research2.12
Jingmai K. O'Connor22
Estimated H-index: 22
(CAS: Chinese Academy of Sciences),
Xiaoli Wang17
Estimated H-index: 17
(LYU: Linyi University)
+ 5 AuthorsZHOUZhonghe47
Estimated H-index: 47
(CAS: Chinese Academy of Sciences)
Abstract Seeds preserved in association with the holotype of Jeholornis prima provided the first direct evidence of granivory in any Mesozoic bird. Although this long boney-tailed bird also displays several morphological indicators correlated with herbivory such as reduced dentition and a deep mandible, Jeholornis has not been previously reported to possess a gastric mill. However, this feature is commonly linked to herbivory in theropod dinosaurs and present in at least one sympatric ornithurom...
Published on Feb 1, 2018in Chinese Science Bulletin
Lida Xing18
Estimated H-index: 18
(China University of Geosciences),
Jingmai K. O'Connor22
Estimated H-index: 22
(CAS: Chinese Academy of Sciences)
+ 7 AuthorsLIGang16
Estimated H-index: 16
(CAS: Chinese Academy of Sciences)
Abstract Cretaceous amber from Myanmar (∼99 Ma Burmese amber) has become a valuable supplement to the traditional skeletal record of small theropod dinosaurs preserved in sedimentary rocks, particularly for coelurosaurs and enantiornithines. The specimens recovered from this deposit preserve skeletal material and soft tissues in unmatched detail. This provides opportunities to study three-dimensional preservation of soft tissues, microstructure, and pigmentation patterns that are seldom availabl...
Published on Jan 31, 2018
Xiaoting Zheng15
Estimated H-index: 15
(LYU: Linyi University),
Jingmai K. O'Connor22
Estimated H-index: 22
+ 2 AuthorsZHOUZhonghe47
Estimated H-index: 47
STM35-3 from the Yixian Formation is the only Early Cretaceous ornithuromorph preserving direct evidence of granivory. The crop contains numerous seeds and the preservation of gastroliths presumably within the ventriculus indicates this diet was paired with the presence of a gastric mill as in living granivorous birds. STM35-3 was originally referred to Hongshanornis longicresta, member of a diverse clade of small, basal ornithuromorphs with elongate hindlimbs known as the Hongshanornithidae. Hi...
Published on Nov 2, 2017in Journal of Systematic Palaeontology2.31
Han Hu6
Estimated H-index: 6
(CAS: Chinese Academy of Sciences),
Jingmai K. O'Connor22
Estimated H-index: 22
(CAS: Chinese Academy of Sciences)
The Sihedang locality of the Lower Cretaceous Yixian Formation is the only recognized ornithuromorph-dominated locality in the Jehol Group of north-eastern China. Here we report on the first enantiornithine from this locality and erect a new taxon Monoenantiornis sihedangia gen. et sp. nov. The holotype and only specimen preserves a rare ontogenetic stage in which the intermedium is ossified but free from the other proximal tarsals and the tibia, consistent with the pattern of ossification that ...
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