Branched integumental structures in Sinornithosaurus and the origin of feathers

@article{Xu2001BranchedIS,
  title={Branched integumental structures in Sinornithosaurus and the origin of feathers},
  author={Xing Xu and Zhonghua Zhou and Richard O. Prum},
  journal={Nature},
  year={2001},
  volume={410},
  pages={200-204}
}
The evolutionary origin of feathers has long been obscured because no morphological antecedents were known to the earliest, structurally modern feathers of Archaeopteryx. It has been proposed that the filamentous integumental appendages on several theropod dinosaurs are primitive feathers; but the homology between these filamentous structures and feathers has been disputed, and two taxa with true feathers (Caudipteryx and Protarchaeopteryx) have been proposed to be flightless birds… 

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