SUPPLEMENTAL DATA
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ACKNOWLEDGMENTS
The authors acknowledge M. Witton for sharing data, discussions, and useful comments in review, M. Habib for review comments, L. Steel and L. Howard from the Natural History Museum for access to the specimens and completing the CT scans, D. Martill for access to the University of Portsmouth specimen, the staff at the University of Southampton for completing the CT scans, D. Foffa for assistance with figures, and E. Rayfield for comments and suggestions.