A Jurassic ceratosaur from China helps clarify avian digital homologies

  title={A Jurassic ceratosaur from China helps clarify avian digital homologies},
  author={Xing Xu and J. Clark and Jinyou Mo and Jonah N. Choiniere and C. Forster and G. M. Erickson and D. Hone and C. Sullivan and D. Eberth and S. Nesbitt and Qi Zhao and Ren{\'e} Hern{\'a}ndez and Cheng-kai Jia and Feng-lu Han and Y. Guo},
  • Xing Xu, J. Clark, +12 authors Y. Guo
  • Published 2009
  • Biology, Medicine
  • Nature
  • Theropods have traditionally been assumed to have lost manual digits from the lateral side inward, which differs from the bilateral reduction pattern seen in other tetrapod groups. This unusual reduction pattern is clearly present in basal theropods, and has also been inferred in non-avian tetanurans based on identification of their three digits as the medial ones of the hand (I-II-III). This contradicts the many developmental studies indicating II-III-IV identities for the three manual digits… CONTINUE READING
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