dumerilii, Trygon (Taenura) Castelnau [F. L.] 1855:101, Pl. 48 (fig. 1) [Animaux nouveaux or rares v. 2; ref. 766] Rio Araguaya [=Araguaia], Brazil. Holotype (unique): MNHN 0000-2367 (poor condition). Type catalog: Bertin 1939:89 [ref. 20739], Séret & McEachran 1987:20-21 [ref. 9312]. Name listed as Taenura dumerilii on figure caption. •Valid as Potamotrygon dumerilii (Castelnau 1855) -- (Castex 1964:23 [ref. 20924], Compagno 1999:495 [ref. 25589], Silva & Carvalho 2015:5 [ref. 33871], Roberts 2021:100 [ref. 38077]). •Status questionable -- (Carvalho et al. 2011:2 [ref. 31264]). •Synonym of Potamotrygon orbignyi (Castelnau 1855) -- (Carvalho et al. in Reis et al. 2003:25 [ref. 27061], Weigmann 2016:157 [ref. 34211], Carvalho 2016:537 [ref. 34666]). Current status: Synonym of Potamotrygon orbignyi (Castelnau 1855). Potamotrygonidae: Potamotrygoninae. Habitat: freshwater.