M. R. de Carvalho and M. P. Ragno, “ An unusual, dwarf new species of Neotropical freshwater stingray, Plesiotrygon nana sp. nov., from the upper and mid Amazon basin: the second species of Plesiotrygon (Chondrichthyes: Potamotrygonidae) ”, Pap. Avulsos Zool., vol. 51, no. 7, pp. 101–138, Jan. 2011, doi: 10.1590/S0031-10492011000700001.