1. Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado 80205, U.S.A.,
2. Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York 11794-8081, U.S.A.
3. Department of Anatomy, New York Institute of Technology, College of Osteopathic Medicine, Old Westbury, New York 11568, U.S.A.,
4. Department of Anthropology, Stony Brook University, Stony Brook, New York 11794-4364, U.S.A.,
5. Section of Mammals, Carnegie Museum of Natural History, 5800 Baum Boulevard, Pittsburgh, Pennsylvania 15206, U.S.A.,
6. Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky 40202, U.S.A.,
7. Department of Anthropology and Vertebrate Paleontology Laboratory, Jackson School Museum of Earth History, University of Texas at Austin, Texas 78712, U.S.A.,
8. Department of Biomedical Sciences, Ohio University Heritage College of Osteopathic Medicine, Ohio University, Athens, Ohio 45701, U.S.A.,