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ACKNOWLEDGMENTS
We would like to thank R. Asher (University of Cambridge), S. Holwell (University of Bristol), J. Hooker (Natural History Museum, London) and C. Norris (American Museum of Natural History) for access to various specimens. We are also grateful to T. Rowe and J. Maisano (University of Texas) for 3D data produced with funding from NSF grant IIS-0208675 awarded to T. Rowe, and DigiMorph.org. Lastly, we are indebted to J. Bright for her advice and assistance with FEA and imaging software, and the anonymous reviewers for their helpful contributions to the final script.
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