About the Authors

Andrew T. McDonald
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

James I. Kirkland, Donald D. DeBlieux, Scott K. Madsen
Utah Geological Survey, Salt Lake City, Utah, United States of America

Jennifer Cavin
John Day Fossil Beds National Monument, Kimberly, Oregon, United States of America

Andrew R. C. Milner
St. George Dinosaur Discovery Site at Johnson Farm, St. George, Utah, United States of America

Lukas Panzarin
Naturalist Illustrator, Torre di Mosto, Venice, Italy

Corresponding Author

mcandr@sas.upenn.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ATM JK. Performed the experiments: ATM. Analyzed the data: ATM. Contributed reagents/materials/analysis tools: ATM JK DD SM JC AM. Wrote the paper: ATM. Created life restorations of the new species: LP.