Christopher A. Brochu,^1,2,3 Harold N. Bryant,⁴ Jessica M. Theodor,^5,6 Maureen A. O'Leary,⁷ Jonathan M. Adrain,⁸ Colin D. Sumrall<sup>9,3

1</sup>Christopher A. Brochu. Department of Geology, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605. cbrochu@fieldmuseum.org
²Corresponding author
³Present address: Department of Geoscience, University of Iowa, Iowa City, Iowa 52242
⁴Harold N. Bryant. Royal Saskatchewan Museum, 2340 Albert Street, Regina, SK S4P 3V7 Canada
⁵Jessica M. Theodor. Department of Ecology and Evolutionary Biology, Brown University, Box G-B205, Providence, Rhode Island 02912
⁶Present address: Department of Organismic Biology, Ecology, and Evolution, University of California, Los Angeles, California 90095-1606
⁷Maureen A. O'Leary. Department of Anatomical Sciences, Health Sciences Center T-8 (040), State University of New York at Stony Brook, Stony Brook, New York 11794-8081
⁸Jonathan M. Adrain. Department of Geoscience, University of Iowa, Iowa City, Iowa 52242
⁹Colin D. Sumrall. Geier Collections and Research Center, Cincinnati Museum Center, 1720 Gilbert Avenue, Cincinnati, Ohio 45202