Tarsal fusion and the formation of the astragalus in Hylonomus lyelli, the earliest amniote, and other early tetrapods

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ACKNOWLEDGMENTS

We sincerely thank A. C. Milner (NHMUK), R. Carroll (Redpath Museum, McGill University), and K. Shepherd (CMN) for access to specimens. We thank H. Jamniczky for discussions about bone formation around arteries. The manuscript was significantly improved by comments from S. Modesto, J. Müller, F. R. O’Keefe, and an anonymous reviewer. Funding for this research was provided by Natural Science and Engineering Research Council of Canada (NSERC) and Alberta Innovates Predoctoral Scholarships (to T.E.M.) and an NSERC Discovery Grant (to J.S.A.).

Handling editor: Sean Modesto