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Vertebrate Zoology 63(3): 269-275
doi:
10.3897/vz.63.e31442
Published:
18 Dec 2013
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Author
Maria A. Barbosa 
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Universidade do Rio de Janeiro, Rio de Janeiro, 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.