1. Department of Biology, Pennsylvania State University, Shenango Campus, Sharon, Pennsylvania 16146, U.S.A. ()
2. Department of Biology, Whittier College, Whittier, California 90608, U.S.A. ()
3. University of Oklahoma, Sam Noble Museum, Norman, Oklahoma 73072, U.S.A. ()
4. University of Kansas, Department of Ecology and Evolutionary Biology, Lawrence, Kansas 66045, U.S.A. ()