1. Department of Biology, Loyola Marymount University, 1 Loyola Marymount University Drive, Los Angeles, California 90045, U.S.A.,
2. Department of Vertebrate Paleontology, Sam Noble Oklahoma Museum of Natural History, University of Oklahoma, 2401 Chautauqua Avenue, Norman, Oklahoma 73072, U.S.A.,
3. Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 South Floyd, Room 111, Louisville, Kentucky 40202, U.S.A.,