Valentim, F.C.D. & Porto, J.I.R. & Feldberg, E. (2019)
Chromosomal characterization of Amazonian freshwater stingrays with evidence for new karyomorphs and XX/XY sex chromosomes. Genetics and Molecular Biology, 42(3), 578–593
DOI: 10.1590/1678-4685-gmb-2018-0229

de Souza Valentim, F.C. & Porto, J.I.R. & Bertollo, L.A.C. & Gross, M.C. & Feldberg, E. (2013)
XX/XO, a rare sex chromosome system in Potamotrygon freshwater stingray from the Amazon Basin, Brazil. Genetica, 141(7–9), 381–387
DOI: 10.1007/s10709-013-9737-2

de Valentim, F.C.S. & Falcão, J.D.N. & Porto, J.I.R. & Feldberg, E. (2006)
Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil. Genetica, 128(1–3), 33–39
DOI: 10.1007/s10709-005-3816-y