Identity of the avian wing digits: problems resolved and unsolved.

  title={Identity of the avian wing digits: problems resolved and unsolved.},
  author={Rebecca L. Young and Gabe S. Bever and Zhe Wang and G{\"u}nter P. Wagner},
  journal={Developmental dynamics : an official publication of the American Association of Anatomists},
  volume={240 5},
Controversy over bird wing digit identity has been a touchstone for various ideas in the phylogeny of birds, homology, and developmental evolution. This review summarizes the past 10 years of progress toward understanding avian digit identity. We conclude that the sum of evidence supports the Frame Shift Hypothesis, indicating that the avian wing digits have changed anatomical location. Briefly, the derivation of birds from theropod dinosaurs and the positional identities of the avian wing… CONTINUE READING