1. Natural History Museum, University of Oslo , POB 1172 Blindern, NO-0318 Oslo , Norway
2. Laboratory of Ecology and Zoology of Vertebrates (LABEV), Institute of Biological Science, Federal University of Pará , Belém , Para , Brazil
3. Center for Advanced Biodiversity Studies (Ceabio), Biological Sciences Institute, Federal University of Pará , Belém , Para , Brazil