1. Laboratory of Molecular Systematics, Museum of Zoology and Department of Biology University of Michigan Ann Arbor MI 48109‐1048 USA
2. Departamento de Biologia, Instituto de Biociencias Universidade de Sao Paulo 05499 Sao Paulo BRAZIL
3. Herpetology Section, Museum of Natural History 900 Exposition Boulevard Los Angeles CA 90007 USA