Data for: A new jeholornithiform exhibits the earliest appearance of the fused sternum and pelvis in the evolution of avialan dinosaurs

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In order to test the affinities of Kompsornis and the interrelationships among long-tailed birds, we scored the new avialan into an updated version of a large data set focusing on the evolution of the avian stem lineage and analysed it using parsimony and Bayesian inference as tree search strategies. The data files contain the original data matrix, character list and BEAST data.

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