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Jingmai K. O?Connor, Luis M. Chiappe, Cheng-ming Chuong, David J. Bottjer and Hailu You
At least two lineages of Mesozoic birds are known to have possessed a distinct feather morphotype for which there is no neornithine (modern) equivalent. The early stepwise evolution of apparently modern feathers occurred within Maniraptora, basal to the ...
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