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  • Acknowledgements

    H.C.B. was supported by a NERC GW4 PhD studentship. J.W.C. was supported by a BBSRC SWBio PhD studentship. M.N.P. was supported by an 1851 Royal Commission Fellowship. P.C.J.D. was supported by BBSRC grant BB/N000919/1. T.A.W. is supported by a Royal Society Fellowship and NERC grant NE/P00251X/1.

    Author information

    Affiliations

    1. School of Earth Sciences, University of Bristol, Bristol, UK

      • Holly C. Betts
      • , Mark N. Puttick
      • , James W. Clark
      • , Tom A. Williams
      • , Philip C. J. Donoghue
      •  & Davide Pisani
    2. Milner Centre for Evolution, Department of Biology and Biochemistry, University of Bath, Bath, UK

      • Mark N. Puttick
    3. School of Biological Sciences, University of Bristol, Bristol, UK

      • Tom A. Williams
      •  & Davide Pisani

    Contributions

    D.P., P.C.J.D. and T.A.W. designed the study. H.C.B. assembled the datasets and performed the phylogenetic and molecular clock analyses. M.N.P. and J.W.C. contributed further molecular clock analyses. H.C.B., D.P., P.C.J.D. and T.A.W. wrote the manuscript. All authors edited the manuscript and approved the final version.

    Competing interests

    The authors declare no competing interests.

    Corresponding author

    Correspondence to Davide Pisani.

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