The phylogeny of the ornithischian dinosaurs

@article{Butler2008ThePO,
  title={The phylogeny of the ornithischian dinosaurs},
  author={Richard J. Butler and Paul Upchurch and David B. Norman},
  journal={Journal of Systematic Palaeontology},
  year={2008},
  volume={6},
  pages={1 - 40}
}
Synopsis Ornithischia is a familiar and diverse clade of dinosaurs whose global phylogeny has remained largely unaltered since early cladistic analyses in the mid 1980s. Current understanding of ornithischian evolution is hampered by a paucity of explicitly numerical phylogenetic analyses that consider the entire clade. As a result, it is difficult to assess the robustness of current phylogenetic hypotheses for Ornithischia and the effect that the addition of new taxa or characters is likely to… 
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