A Precocial Avian Embryo from the Lower Cretaceous of China

@article{Zhou2004APA,
  title={A Precocial Avian Embryo from the Lower Cretaceous of China},
  author={Zhonghe Zhou and Fucheng Zhang},
  journal={Science},
  year={2004},
  volume={306},
  pages={653 - 653}
}
An embryo of an enantiornithine bird has been recovered from the Lower Cretaceous rocks of Liaoning, in northeast China. The bird has a nearly complete articulated skeleton with feather sheet impressions and is enclosed in egg-shaped confines. The tucking posture of the skeleton suggests that the embryo had attained the final stage of development. The presence of well-developed wing and tail feather sheets indicates a precocial developmental mode, supporting the hypothesis that precocial birds… Expand

Topics from this paper

Xinghaiornis lini (Aves: Ornithothoraces) from the Early Cretaceous of Liaoning: An Example of Evolutionary Mosaic in Early Birds
TLDR
A new species of Early Cretaceous bird from the Yixian Formation of Liaoning Province is described, providing strong support indicating that this avian trophic specialization originated at least 125 million years ago. Expand
Enantiornithine Birds in China
TLDR
Although enantiornithine birds show great morphological differences from modern birds, their diversification in many respects mimics that of the modern land bird radiation and the reasons for their extinction at the end-Cretaceous remain a mystery. Expand
Juvenile Birds from the Early Cretaceous of China: Implications for Enantiornithine Ontogeny
TLDR
The skeletal morphology of three nearly complete early juvenile avians from the renowned Early Cretaceous Yixian Formation of Liaoning Province in northeastern China are reported on, suggesting that fledging occurred very early in ontogeny, thus supporting a precocial or highly precocial strategy for enantiornithine hatchlings. Expand
A mixed vertebrate eggshell assemblage from the Transylvanian Late Cretaceous
A Late Cretaceous-aged multi-taxon nesting site from Romania preserved in three dimensions reveals the earliest example of nest site sharing yet known from the vertebrate fossil record. Eggshell andExpand
The oldest known amniotic embryos suggest viviparity in mesosaurs
TLDR
The finds of exceptional, well-preserved amniotic mesosaur embryos from the Early Permian of Uruguay and Brazil provide the earliest direct evidence of reproductive biology in Paleozoic amniotes and the earliest known case of viviparity. Expand
Insight into the early evolution of the avian sternum from juvenile enantiornithines.
TLDR
Although superficially similar, the sternum formed very differently in enantiornithines and ornithuromorphs, suggesting that several ornithothoracine sternal features may represent parallelism, highlights the importance of ontogenetic studies for understanding homology and the evolution of skeletal features in palaeontology. Expand
Mummified precocial bird wings in mid-Cretaceous Burmese amber
TLDR
These specimens demonstrate that the plumage types associated with modern birds were present within single individuals of Enantiornithes by the Cenomanian, providing insights into plumage arrangement and microstructure alongside immature skeletal remains. Expand
A New Enantiornithine from the Yixian Formation with the First Recognized Avian Enamel Specialization
ABSTRACT We report on a new enantiornithine bird, Sulcavis geeorum, gen. et sp. nov., from the Jehol Group of northeastern China. The fossil preserves robust teeth with longitudinal groovesExpand
Cannibalism in a semi-aquatic reptile from the Early Cretaceous of China
1. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; 2. Natural History Museum and Biodiversity Research Center, University of Kansas,Expand
A fully feathered enantiornithine foot and wing fragment preserved in mid-Cretaceous Burmese amber
TLDR
A remarkably well-preserved foot, accompanied by part of the wing plumage, is described, providing direct analogies to the plumage patterns observed in modern birds, and those cultivated through developmental manipulation studies. Expand
...
1
2
3
4
5
...

References

SHOWING 1-2 OF 2 REFERENCES
A comparative embryological study of two ornithischian dinosaurs
TLDR
The unusual teeth of Troodon, possessing cylindrical roots similar to ornithischians, exacerbated the identity problem in these embryos and added to an already long history of confusion. Expand
Activation of complement by an IgG molecule without a genetic hinge
TLDR
It is concluded that the hinge functioning as a spacer is not a prerequisite for complement activation, rather, its major role seems to be to connect the heavy chains to each other in the amino-terminal part of CH2. Expand