@article{valentim_porto_feldberg_2019,  title={Chromosomal characterization of Amazonian freshwater stingrays with evidence for new karyomorphs and XX/XY sex chromosomes},  volume={42},  ISSN={1415-4757},  url={https://doi.org/10.1590/1678-4685-GMB-2018-0229},  DOI={10.1590/1678-4685-GMB-2018-0229},  number={3},  journal={Genetics and Molecular Biology},  publisher={Sociedade Brasileira de Genética},  author={Valentim, Francisco Carlos de Souza and Porto, Jorge Ivan Rebelo and Feldberg, Eliana},  year={2019},  month={Jul},  pages={578–593} }