ACKNOWLEDGMENTS
We thank the following individuals and institutions for the loan of or access to specimens: P. Holroyd, University of California Museum of Paleontology, Berkeley; J. McNamara, M.-A. Binnie, and D. Rice, South Australian Museum, Adelaide; N. Cooper and C. Stephenson, Western Australian Museum, Perth; R. Jones, Australian Museum, Sydney. R. Beck and an anonymous reviewer provided helpful comments.
Handling editor: Anjali Goswami