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. 2021 Jan 13;12:354. doi: 10.1038/s41467-020-20507-3

Fig. 2. Synchronous temporal and geographic origin for swallowtails and birthworts.

Fig. 2

Bayesian molecular divergence times with exponential priors estimate an early Eocene origin (~55 Ma) for both swallowtails and Aristolochia (alternatively, analyses with a uniform prior estimated an origin around 67 Ma for swallowtails and 64 Ma for Aristolochia; Supplementary Figs. 3, 8 and 9). Biogeographical maximum-likelihood models infer an ancestral area of origin comprising West Nearctic, East Palaearctic and Central America for both swallowtails and birthworts (Supplementary Figs. 10 and 11). Paleoc Paleocene, Pl Pliocene, P Pleistocene, Ma million years ago. Pictures of the plant and butterfly made by Fabien Condamine, and the world map made by Rémi Allio.