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Vertebrate Zoology 63(2): 161-169
doi:
10.3897/vz.63.e31423
Published:
29 Aug 2013
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Author
Felipe Polivanov Ottoni 
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Universidade Federal do Maranhão, Chapadinha, Brazil
Federal University of Maranhão, Brazil
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Conflict of interest
The author has declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.