Carvalho, M.R. de and Ragno, M.P. 2011. 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) . Papéis Avulsos de Zoologia. 51, 7 (Jan. 2011), 101–138. DOI:https://doi.org/10.1590/S0031-10492011000700001.