1. Department of Bacteriology, University of Wisconsin-MadisonMadison, WI 53706, USA
2. Department of Ecology and Evolutionary Biology, University of KansasLawrence, KS 66045, USA
3. Smithsonian Tropical Research InstituteApartado Box 2072 Balboa, Ancon, Republic de Panama
4. Chromosome Research Unit, Faculty of Science, Hokkaido UniversitySapporo 060-0810, Japan
5. Section of Integrative Biology, Patterson Laboratories, University of Texas at AustinAustin, TX 78712, USA