About the Authors

Paul C. Sereno

To whom correspondence should be addressed. E-mail: dinosaur@uchicago.edu

Affiliation Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, United States of America

Jeffrey A. Wilson

Affiliation Museum of Paleontology and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan, United States of America

Lawrence M. Witmer

Affiliation Department of Biomedical Sciences, College of Osteopathic Medicine, Ohio University, Athens, Ohio, United States of America

John A. Whitlock

Affiliation Museum of Paleontology and Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan, United States of America

Abdoulaye Maga

Affiliation Institute for Human Science, University of Niamey, Niamey, Republic of Niger

Oumarou Ide

Affiliation Institute for Human Science, University of Niamey, Niamey, Republic of Niger

Timothy A. Rowe

Affiliation Jackson School of Geological Sciences, The University of Texas at Austin, Austin, Texas, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Involved in writing sections of the paper: PCS JAW-1 LMW JAW-2. Participants in discovering the fossil material: PCS JAW-1 AM OI. Involved in interpreting the fossil material: PCS JAW-1. Involved in CT-scanning, rendering from scans, and interpreting fossil material that was scanned: PCS LMW TAR. Conducted the microwear analysis: JAW-2. Conducted the phylogenetic analysis: JAW-1 JAW-2.