About the Authors

Mark A. Loewen

mloewen@nhmu.utah.edu

Affiliation Natural History Museum of Utah and Department of Geology & Geophysics, University of Utah, Salt Lake City, Utah, United States of America

Randall B. Irmis

Affiliation Natural History Museum of Utah and Department of Geology & Geophysics, University of Utah, Salt Lake City, Utah, United States of America

Joseph J. W. Sertich

Affiliation Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado, United States of America

Philip J. Currie

Affiliation Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada

Scott D. Sampson

Affiliations Natural History Museum of Utah and Department of Geology & Geophysics, University of Utah, Salt Lake City, Utah, United States of America, Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MAL. Performed the experiments: MAL RBI JJWS PJC SDS. Analyzed the data: MAL RBI JJWS PJC SDS. Wrote the paper: MAL RBI JJWS. Scored characters for taxa in the phylogenetic analysis: MAL RBI JJWS. Conducted the biogeographic analysis: MAL RBI.