New subclass of birds from the Cretaceous of South America

@article{Walker1981NewSO,
  title={New subclass of birds from the Cretaceous of South America},
  author={Cyril A. Walker},
  journal={Nature},
  year={1981},
  volume={292},
  pages={51-53}
}
Current classification of birds recognizes three subclasses which are morphologically distinct: the Archaeornithes for Archaeopteryx, the Odontornithes for the Hesperornithiformes and the Ichthyornithiformes, and the Neornithes for all modern birds and their extinct immediate relatives. (Some authorities1 prefer different names for some of these taxa.) I have examined new material recently discovered in the Upper Cretaceous rocks of Argentina which indicates the existence of a group of birds… Expand
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References

A reconsideration of the reptilian relationships of Archaeopteryx
TLDR
The cladistic relationships of Archaeopteryx, the earliest known bird, are re-examined and previous hypotheses of relationships evaluated and a new version of thecodontian relationships is suggested. Expand