rex, Potamotrygon Carvalho [M. R. de] 2016:538, Figs. 1-13, 15, 16A, B [Zootaxa 4150 (no. 5); ref. 34666] Rio Tocantins near the mouth of the right bank tributary of rio Manoel Alves, Tocantins state, Brazil, 11°18'55"S, 48°27'28"W. Holotype: MZUSP 120371. Paratypes: MZUSP, UNT. Plus non-type material. •Valid as Potamotrygon rex Carvalho 2016 -- (Carvalho 2016:6 [ref. 34730], Carvalho 2016:645 [ref. 34997]). Current status: Valid as Potamotrygon rex Carvalho 2016. Potamotrygonidae: Potamotrygoninae. Distribution: Middle and upper rio Tocantins, Brazil. Habitat: freshwater.