1. Museu Paraense Emílio Goeldi, Belém, Pará, Brazil
2. Departamento de Microbiologia, ICB, C.P. 486, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
3. Department of Biology, University of Western Ontario, London, ON N6A 5B7, Canada