1. Museum of Paleontology and Department of Integrative Biology, University of California, Berkeley, California 94720-3200, U.S.A., kpadian@berkeley.edu
2. Cunningham Engineering Associates, Collierville, Tennessee 38017, U.S.A.
3. Texas Vertebrate Paleontology Collections, University of Texas, Austin, Texas, U.S.A.
4. Johnconway.co, London, U.K.