1. Department of Anatomy, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York 11568, U.S.A.,
2. School of Science, Engineering and Environment, University of Salford, Manchester M5 4WT, U.K.,
3. Section of Mammals, Carnegie Museum of Natural History, 5800 Baum Boulevard, Pittsburgh, Pennsylvania 15206, U.S.A.,
4. Department of Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky 40202, U.S.A.,
5. Department of Earth Sciences, Denver Museum of Nature & Science, Denver, Colorado 80205, U.S.A.,
6. Department of Anatomical Sciences, Stony Brook University, Stony Brook, New York 11794-8081, U.S.A.