1. Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, P. O. Box 486, 30161‐970 Belo Horizonte, Minas Gerais, Brazil
2. Hydrobiology and Fishculture Station of Três Marias, Minas Gerais–CODEVASF, 39205‐00, Três Marias, MG, Brazil
3. Graduate Program on Zoology of Vertebrates–Pontifical Catholic University of Minas Gerais, 30535‐610, Belo Horizonte, MG, Brazil