Appendix

Results of correlation tests between cursoriality index and body size, and between cursoriality index and bipedality index after the effect of body size was removed, among Triassic archosaurs. The default settings of the correlation tests were (1) a branch length of one set for all branches and (2) reconstructed phylogenetic relationships among Triassic archosaurs (Fig. 2). Additional sensitivity analyses with arbitrary branch length (Grafen, Nee, and Pagel), temporal duration as branch lengths, or polytomic relationship (Fig. 2B) did not alter the result significantly. The analysis was also conducted with restricted taxa, which are crurotarsans, ornithodirans, and ornithodirans without sauropodomorphs except Eoraptor.