[PaleoOrnithology • 2016]
Chongmingia zhengi • A New Basal Bird from China with implications for Morphological Diversity in Early Birds
Chongmingia zhengi
Wang, Wang, Wang & Zhou, 2016
doi: 10.1038/srep19700
|
Abstract
The Chinese Lower Cretaceous Jehol Group is the second oldest fossil bird-bearing deposit, only surpassed by Archaeopteryx from the German Upper Jurassic Solnhofen Limestones. Here we report a new bird, Chongmingia zhengi gen. et sp. nov., from the Jehol Biota. Phylogenetic analyses indicate that Chongmingia zhengi is
basal to the dominant Mesozoic avian clades Enantiornithes and
Ornithuromorpha, and represents a new basal avialan lineage. This new
discovery adds to our knowledge regarding the phylogenetic
differentiation and morphological diversity in early avian evolution.
The furcula of Chongmingia is rigid (reducing its efficiency),
consequently requiring more power for flight. However, the elongated
forelimb and the large deltopectoral crest on the humerus might indicate
that the power was available. The unique combination of features
present in this species demonstrates that numerous evolutionary
experimentations took place in the early evolution of powered flight.
The occurrence of gastroliths further confirms that herbivory was common
among basal birds. The Jehol birds faced competition with pterosaurs,
and occupied sympatric habitats with non-avian theropods, some of which
consumed birds. Thus, avialan herbivory may have reduced ecological
competition from carnivorous close relatives and other volant
vertebrates early in their evolutionary history.
Systematic paleontology
Aves Linnaeus, 1758
Chongmingia zhengi gen. et sp. nov.
Etymology: The generic name is from the Mandarin word Chongming, referring to a Chinese mythological bird. The specific epithet is in honour of Mr. Xiaoting Zheng for his generous contribution in the establishment of the Shandong Tianyu Museum of Nature.
Holotype: STM (Shandong Tianyu Museum of Nature) 9-9, a partial
skeleton with associated soft tissues and gastroliths, missing the skull
and most of the caudal vertebrae (Fig. 1).
Locality and horizon: Dapingfang, Liaoning Province, China; Jiufotang Formation, Early Cretaceous (Aptian).
Figure 1: Photograph and line drawing of the holotype of Chongmingia zhengi gen. et sp. nov. (STM9-9). |
Figure 7: Simplified Mesozoic avian cladogram showing the possible phylogenetic positions of Chongmingia zhengi. Analysis using the coelurosaurian matrix places Chongmingia within basal avialans and as the sister group to Ornithothoraces (p1), and analysis using the Mesozoic avian matrix resolves Chongmingia as the most basal avialan, except for Archaeopteryx (p2).
See Supplementary Figs 2–4 for complete results. (The skeletal drawing and silhouettes were drawn by Min Wang). doi: 10.1038/srep19700
|
Min Wang, Xiaoli Wang, Yan Wang and Zhonghe Zhou. 2016. A New Basal Bird
from China with implications for Morphological Diversity in Early
Birds.
Scientific Reports. 6: 19700. DOI: 10.1038/srep19700
Scientific Reports. 6: 19700. DOI: 10.1038/srep19700
Nenhum comentário:
Postar um comentário
Observação: somente um membro deste blog pode postar um comentário.