1. Museum of Vertebrate Zoology, Department of Integrative Biology, University of California, Berkeley, CA 94720-3160, USA
2. Present address: School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia
3. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
4. Departamento de Biología Evolutiva, Facultad de Ciencias, Universidad Nacional Autónoma de México, México D.F. 04510, México
5. Museo de Zoología, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, México D.F. 09230, México
6. Department of Zoology, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan
7. Institute of Natural and Environmental Sciences and Museum of Nature and Human Activities, University of Hyogo, Yayoigaoka, Sanda, Hyogo 669-1546, Japan